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x in (-oo:+oo)
x/4-(2*y) = -1 // + 1
x/4-(2*y)+1 = 0
x/4-2*y+1 = 0
1/4*x-2*y+1 = 0 // - 1-2*y
1/4*x = -(1-2*y) // : 1/4
x = (-(1-2*y))/1/4
x = -4*(1-2*y)
x = -4*(1-2*y)
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