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x in (-oo:+oo)
10/12 = x/100 // - x/100
10/12-(x/100) = 0
5/6-1/100*x = 0 // - 5/6
-1/100*x = -5/6 // : -1/100
x = -5/6/(-1/100)
x = 250/3
x = 250/3
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