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x in (-oo:+oo)
91/100 = x/1000 // - x/1000
91/100-(x/1000) = 0
91/100-1/1000*x = 0 // - 91/100
-1/1000*x = -91/100 // : -1/1000
x = -91/100/(-1/1000)
x = 910
x = 910
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