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