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x in (-oo:+oo)
Y = (-3/8)*x+5 // - (-3/8)*x+5
Y-((-3/8)*x)-5 = 0
Y+(3/8)*x-5 = 0
Y+3/8*x-5 = 0 // - Y-5
3/8*x = -(Y-5) // : 3/8
x = (-(Y-5))/3/8
x = 8/3*(5-Y)
x = 8/3*(5-Y)
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