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x in (-oo:+oo)
x/100 = 60/70 // - 60/70
x/100-(60/70) = 0
x/100-6/7 = 0
1/100*x-6/7 = 0 // + 6/7
1/100*x = 6/7 // : 1/100
x = 6/7/1/100
x = 600/7
x = 600/7
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