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)
-y = (1/2)*x-2 // - (1/2)*x-2
2-((1/2)*x)-y = 0
(-1/2)*x-y+2 = 0
2-1/2*x-y = 0 // - 2-y
-1/2*x = -(2-y) // : -1/2
x = (-(2-y))/(-1/2)
x = -2*(y-2)
x = -2*(y-2)
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