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