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