Question

1). 3x + 7 = 9
2). -3(x + 5) + 3 = 12

Can you also please show the work so that I may have a better understanding.

Answer 1

1). 3x + 7 = 9
subtract 7 from both sides
3 x = 2
divide both sides by 3
x = 2/3

2). -3(x + 5) + 3 = 12
subtract 3 from both sides
-3(x+5) = 9
divide both sides by -3
x+5 = -3
subtract 5 from both sides
x = -8

Answer 2

so easy

Answer 3

i don't know what to do