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x in (-oo:+oo)
x/198 = 10/100 // - 10/100
x/198-(10/100) = 0
x/198-1/10 = 0
1/198*x-1/10 = 0 // + 1/10
1/198*x = 1/10 // : 1/198
x = 1/10/1/198
x = 99/5
x = 99/5
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