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x in (-oo:+oo)
x = 4*(3-((3/4)*y)) // - 4*(3-((3/4)*y))
x-(4*(3-((3/4)*y))) = 0
x-4*((-3/4)*y+3) = 0
x-4*(3-3/4*y) = 0
x-4*(3-3/4*y) = 0
x+3*y-12 = 0
x+3*y-12 = 0
x+3*y-12 = 0 // - 3*y-12
x = -(3*y-12)
x = 12-(3*y)
x = 12-(3*y)
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