If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(1/2)*y = x-3 // - x-3
(1/2)*y-x+3 = 0
1/2*y-x+3 = 0 // - 1/2*y+3
-x = -(1/2*y+3) // * -1
x = 1/2*y+3
x = 1/2*y+3
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