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x in (-oo:+oo)
Y = (-3/5)*x+19 // - (-3/5)*x+19
Y-((-3/5)*x)-19 = 0
Y+(3/5)*x-19 = 0
Y+3/5*x-19 = 0 // - Y-19
3/5*x = -(Y-19) // : 3/5
x = (-(Y-19))/3/5
x = 5/3*(19-Y)
x = 5/3*(19-Y)
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