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x in (-oo:+oo)
12/10 = x/30 // - x/30
12/10-(x/30) = 0
6/5-1/30*x = 0 // - 6/5
-1/30*x = -6/5 // : -1/30
x = -6/5/(-1/30)
x = 36
x = 36
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