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x in (-oo:+oo)
2*x = 15/7 // - 15/7
2*x-(15/7) = 0
2*x-15/7 = 0
2*x-15/7 = 0 // + 15/7
2*x = 15/7 // : 2
x = 15/7/2
x = 15/14
x = 15/14
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