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x in (-oo:+oo)
1/15 = (-1/2)*x // - (-1/2)*x
1/15-((-1/2)*x) = 0
(1/2)*x+1/15 = 0
1/2*x+1/15 = 0 // - 1/15
1/2*x = -1/15 // : 1/2
x = -1/15/1/2
x = -2/15
x = -2/15
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