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x in (-oo:+oo)
x/2-(3*y) = -1 // + 1
x/2-(3*y)+1 = 0
x/2-3*y+1 = 0
1/2*x-3*y+1 = 0 // - 1-3*y
1/2*x = -(1-3*y) // : 1/2
x = (-(1-3*y))/1/2
x = -2*(1-3*y)
x = -2*(1-3*y)
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