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x in (-oo:+oo)
y = (-5/3)*x+6 // - (-5/3)*x+6
y-((-5/3)*x)-6 = 0
(5/3)*x+y-6 = 0
5/3*x+y-6 = 0 // - y-6
5/3*x = -(y-6) // : 5/3
x = (-(y-6))/5/3
x = 3/5*(6-y)
x = 3/5*(6-y)
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