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