Solve for x 2 (x+9) = x+21

Answer: x = 3

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

2 (x+9) = x+21

(2) (x) + (2) (9) = x+21 (Distribute)

2x+18=x+21

Step 2: Subtract x from both sides.

2x+18-x=x+21-x

x+18=21

Step 3: Subtract 18 from both sides.

x+18-18=21-18

x=3