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