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x in (-oo:+oo)
x/140 = 15/100 // - 15/100
x/140-(15/100) = 0
x/140-3/20 = 0
1/140*x-3/20 = 0 // + 3/20
1/140*x = 3/20 // : 1/140
x = 3/20/1/140
x = 21
x = 21
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