12-x/9 =11

To solve for x, we can first multiply both sides of the equation by 9 to get rid of the fraction:

12 - x = 99

Next, we can isolate x by subtracting 12 from both sides:

-x = 87

Finally, we can multiply both sides by -1 to solve for x:

x = -87

Therefore, x = -87.

-20=-5+3x

To solve for x, we can first isolate the variable by moving the constant terms to the other side of the equation. Here's how:

-20 = -5 + 3x

First, we can add 5 to both sides:

-20 + 5 = 3x

-15 = 3x

Finally, we can divide both sides by 3 to solve for x:

-15/3 = x

x = -5

Therefore, x = -5.

20=5-3/8 x

To solve for x, we can first isolate the variable by moving the constant terms to the other side of the equation. Here's how:

20 = 5 - 3/8x

First, we can subtract 5 from both sides:

20 - 5 = -3/8x

15 = -3/8x

Then, we can isolate x by multiplying both sides by the multiplicative inverse of -3/8, which is -8/3:

15(-8/3) = x

-40 = x

Therefore, x = -40.

7(4x-15)=63

To solve for x, we first need to distribute the 7 on the left side of the equation:

28x - 105 = 63

Next, we combine like terms by adding 105 to both sides:

28x = 168

Then, we divide by 28 to isolate x:

x = 168 / 28

x = 6

Therefore, x = 6.

-2(3x-15)-25=35

To solve for x, we need to first simplify the left side of the equation by distributing the -2:

-6x + 30 - 25 = 35

Combine like terms:

-6x + 5 = 35

Next, isolate the variable by subtracting 5 from both sides:

-6x = 30

Finally, divide by -6 to solve for x:

x = -5

Therefore, x = -5.

12x+5=10x-11

To solve for x, we need to isolate the variable. Let's do that step by step:

First, let's move all terms containing x to one side of the equation by subtracting 10x from both sides:

12x - 10x + 5 = -11

Simplify:

2x + 5 = -11

Next, we need to isolate x by subtracting 5 from both sides:

2x = -16

Finally, divide by 2 to solve for x:

x = -8

Therefore, x = -8.