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x in (-oo:+oo)
Y = (-5/2)*x-7 // - (-5/2)*x-7
Y-((-5/2)*x)+7 = 0
Y+(5/2)*x+7 = 0
Y+5/2*x+7 = 0 // - Y+7
5/2*x = -(Y+7) // : 5/2
x = (-(Y+7))/5/2
x = -2/5*(Y+7)
x = -2/5*(Y+7)
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