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x in (-oo:+oo)
5*x = 15/7 // - 15/7
5*x-(15/7) = 0
5*x-15/7 = 0
5*x-15/7 = 0 // + 15/7
5*x = 15/7 // : 5
x = 15/7/5
x = 3/7
x = 3/7
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