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x in (-oo:+oo)
12/30 = x/10 // - x/10
12/30-(x/10) = 0
2/5-1/10*x = 0 // - 2/5
-1/10*x = -2/5 // : -1/10
x = -2/5/(-1/10)
x = 4
x = 4
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