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x in (-oo:+oo)
y = (3/2)*x+12 // - (3/2)*x+12
y-((3/2)*x)-12 = 0
(-3/2)*x+y-12 = 0
y-3/2*x-12 = 0 // - y-12
-3/2*x = -(y-12) // : -3/2
x = (-(y-12))/(-3/2)
x = -2/3*(12-y)
x = -2/3*(12-y)
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