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