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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*(y+9)
x = 4/3*(y+9)
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