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