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