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x in (-oo:+oo)
(1/8)*x-((3/4)*y) = -1 // + 1
(1/8)*x-((3/4)*y)+1 = 0
(1/8)*x+(-3/4)*y+1 = 0
1/8*x-3/4*y+1 = 0 // - 1-3/4*y
1/8*x = -(1-3/4*y) // : 1/8
x = (-(1-3/4*y))/1/8
x = -8*(1-3/4*y)
x = -8*(1-3/4*y)
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