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x in (-oo:+oo)
60 = (100*x)/20+x // - (100*x)/20+x
60-((100*x)/20)-x = 0
60-5*x-x = 0
60-6*x = 0 // - 60
-6*x = -60 // : -6
x = -60/(-6)
x = 10
x = 10
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