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