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x in (-oo:+oo)
3-((3/4)*y) = (9/2)*x // - (9/2)*x
3-((9/2)*x)-((3/4)*y) = 0
(-9/2)*x+(-3/4)*y+3 = 0
3-9/2*x-3/4*y = 0 // - 3-3/4*y
-9/2*x = -(3-3/4*y) // : -9/2
x = (-(3-3/4*y))/(-9/2)
x = 2/9*(3-3/4*y)
x = 2/9*(3-3/4*y)
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