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