To solve for y, we add 2x to both sides
y-2x = 15
y-2x+2x = 15+2x
y = 2x+15
To solve for x, we subtract y from both sides. Then divide both sides by -2.
-2x = 15-y
x = (15-y)/(-2)
x = -(15-y)/2
x = (y-15)/2
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