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x in (-oo:+oo)
y = (3/2)*x+54 // - (3/2)*x+54
y-((3/2)*x)-54 = 0
(-3/2)*x+y-54 = 0
y-3/2*x-54 = 0 // - y-54
-3/2*x = -(y-54) // : -3/2
x = (-(y-54))/(-3/2)
x = -2/3*(54-y)
x = -2/3*(54-y)
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