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x in (-oo:+oo)
x/20 = 70/100 // - 70/100
x/20-(70/100) = 0
x/20-7/10 = 0
1/20*x-7/10 = 0 // + 7/10
1/20*x = 7/10 // : 1/20
x = 7/10/1/20
x = 14
x = 14
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