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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*(y+3)
x = -5/3*(y+3)
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