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x in (-oo:+oo)
y = (-15/13)*x+33/45 // - (-15/13)*x+33/45
y-((-15/13)*x)-(33/45) = 0
(15/13)*x+y-11/15 = 0
15/13*x+y-11/15 = 0 // - y-11/15
15/13*x = -(y-11/15) // : 15/13
x = (-(y-11/15))/15/13
x = 13/15*(11/15-y)
x = 13/15*(11/15-y)
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