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