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x in (-oo:+oo)
Y = (3/2)*x-7 // - (3/2)*x-7
Y-((3/2)*x)+7 = 0
Y+(-3/2)*x+7 = 0
Y-3/2*x+7 = 0 // - Y+7
-3/2*x = -(Y+7) // : -3/2
x = (-(Y+7))/(-3/2)
x = 2/3*(Y+7)
x = 2/3*(Y+7)
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