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x in (-oo:+oo)
(1/3)*x+y = 12 // - 12
(1/3)*x+y-12 = 0
1/3*x+y-12 = 0 // - y-12
1/3*x = -(y-12) // : 1/3
x = (-(y-12))/1/3
x = 3*(12-y)
x = 3*(12-y)
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