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x in (-oo:+oo)
x/140 = 6/200 // - 6/200
x/140-(6/200) = 0
x/140-3/100 = 0
1/140*x-3/100 = 0 // + 3/100
1/140*x = 3/100 // : 1/140
x = 3/100/1/140
x = 21/5
x = 21/5
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