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x in (-oo:+oo)
x/0.7 = 15/35 // - 15/35
x/0.7-(15/35) = 0
x/0.7-3/7 = 0
1.42857143*x-3/7 = 0 // + 3/7
1.42857143*x = 3/7 // : 1.42857143
x = 3/7/1.42857143
x = 0.3
x = 0.3
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