What is 4 (x+3) = 2 (2x+9)

What is x

First distribute 4 into the corresponding parenthesis.

4x+12

Then distribute 2 into the other corresponding parentheses.

4x+18

So together you get 4x+12=4x+18

No we want to get all our variables on one side and our numbers on the other side.

We can do this by combining like terms/

First subtract 12 from both sides

4x=4x+30

Then subtract 4x from both sides

0=30

The equation is false