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x in (-oo:+oo)
3/10 = x/100 // - x/100
3/10-(x/100) = 0
3/10-1/100*x = 0 // - 3/10
-1/100*x = -3/10 // : -1/100
x = -3/10/(-1/100)
x = 30
x = 30
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