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x in (-oo:+oo)
3/10 = x/30 // - x/30
3/10-(x/30) = 0
3/10-1/30*x = 0 // - 3/10
-1/30*x = -3/10 // : -1/30
x = -3/10/(-1/30)
x = 9
x = 9
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