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