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