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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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