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x in (-oo:+oo)
(3/8)*x-((1/2)*y) = 1 // - 1
(3/8)*x-((1/2)*y)-1 = 0
(3/8)*x+(-1/2)*y-1 = 0
3/8*x-1/2*y-1 = 0 // + -1/2*y-1
3/8*x = -(-1/2*y-1) // : 3/8
x = (-(-1/2*y-1))/3/8
x = 8/3*(1-(-1/2*y))
x = 8/3*(1-(-1/2*y))
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