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x in (-oo:+oo)
Y = (5/4)*x-15 // - (5/4)*x-15
Y-((5/4)*x)+15 = 0
Y+(-5/4)*x+15 = 0
Y-5/4*x+15 = 0 // - Y+15
-5/4*x = -(Y+15) // : -5/4
x = (-(Y+15))/(-5/4)
x = 4/5*(Y+15)
x = 4/5*(Y+15)
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