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x in (-oo:+oo)
x/14 = 15/7 // - 15/7
x/14-(15/7) = 0
x/14-15/7 = 0
1/14*x-15/7 = 0 // + 15/7
1/14*x = 15/7 // : 1/14
x = 15/7/1/14
x = 30
x = 30
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