Question

x+2y=8 solve for x

Answer 1

subtract 2y from both sides

Answer 2

x+2y=8

so like abb0t said, subtract 2y from both sides first.

x+2y=8
-2y -2y
---- ---

x + 0 = 8 - 2y

x = -2y + 8
or
x = 8 - 2y