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x in (-oo:+oo)
Y = (10/4)*x+y // - (10/4)*x+y
Y-((10/4)*x)-y = 0
Y+(-5/2)*x-y = 0
Y-5/2*x-y = 0 // - Y-y
-5/2*x = -(Y-y) // : -5/2
x = (-(Y-y))/(-5/2)
x = -2/5*(y-Y)
x = -2/5*(y-Y)
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