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x in (-oo:+oo)
100 = 120-(120*(x/100)) // - 120-(120*(x/100))
120*(x/100)-120+100 = 0
6/5*x-20 = 0 // + 20
6/5*x = 20 // : 6/5
x = 20/6/5
x = 50/3
x = 50/3
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