Question 14189
4x+3=15-2x

You need to get x on one side and solve, everything you do on one side you need to do on the other.

LHS subtract 3, RHS subtract 3
4x=15-2x-3

LHS add 2x, RHS add 2x
4x+2x=15-3

simplify like terms
6x=12

divide by 6 to get x by itself
x=2