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x in (-oo:+oo)
Y = (-5/3)*x+4 // - (-5/3)*x+4
Y-((-5/3)*x)-4 = 0
Y+(5/3)*x-4 = 0
Y+5/3*x-4 = 0 // - Y-4
5/3*x = -(Y-4) // : 5/3
x = (-(Y-4))/5/3
x = 3/5*(4-Y)
x = 3/5*(4-Y)
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