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x in (-oo:+oo)
3/15 = 2*x // - 2*x
3/15-(2*x) = 0
3/15-2*x = 0
1/5-2*x = 0 // - 1/5
-2*x = -1/5 // : -2
x = -1/5/(-2)
x = 1/10
x = 1/10
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