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x in (-oo:+oo)
(1/3)*x+y = -15 // + 15
(1/3)*x+y+15 = 0
1/3*x+y+15 = 0 // - y+15
1/3*x = -(y+15) // : 1/3
x = (-(y+15))/1/3
x = -3*(y+15)
x = -3*(y+15)
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