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x in (-oo:+oo)
6/10 = x/30 // - x/30
6/10-(x/30) = 0
3/5-1/30*x = 0 // - 3/5
-1/30*x = -3/5 // : -1/30
x = -3/5/(-1/30)
x = 18
x = 18
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