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x in (-oo:+oo)
3-((3/4)*y) = 6*x // - 6*x
3-(6*x)-((3/4)*y) = 0
(-3/4)*y-6*x+3 = 0
3-6*x-3/4*y = 0 // - 3-3/4*y
-6*x = -(3-3/4*y) // : -6
x = (-(3-3/4*y))/(-6)
x = (3-3/4*y)/6
x = (3-3/4*y)/6
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