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x in (-oo:+oo)
10 = (-1/3)*x // - (-1/3)*x
10-((-1/3)*x) = 0
(1/3)*x+10 = 0
1/3*x+10 = 0 // - 10
1/3*x = -10 // : 1/3
x = -10/1/3
x = -30
x = -30
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