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