2u+9=8u+21

Answer 1

To solve for u, we first need to isolate the variable on one side of the equation.

Starting with the given equation:

2u + 9 = 8u + 21

Subtract 2u from both sides to get the variable terms on one side:

9 = 6u + 21

Subtract 21 from both sides to isolate the variable term:

-12 = 6u

Now, divide both sides by 6 to solve for u:

-12/6 = u
-2 = u

Therefore, u = -2.