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x in (-oo:+oo)
9-((3*y)/4) = x // - x
9-x-((3*y)/4) = 0
(-3/4)*y-x+9 = 0
9-x-3/4*y = 0 // - 9-3/4*y
-x = -(9-3/4*y) // * -1
x = 9-3/4*y
x = 9-3/4*y
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