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x in (-oo:+oo)
12 = (-1/3)*x // - (-1/3)*x
12-((-1/3)*x) = 0
(1/3)*x+12 = 0
1/3*x+12 = 0 // - 12
1/3*x = -12 // : 1/3
x = -12/1/3
x = -36
x = -36
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