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x in (-oo:+oo)
3*x-(2/7) = 5/2 // - 5/2
3*x-(2/7)-(5/2) = 0
3*x-2/7-5/2 = 0
3*x-39/14 = 0 // + 39/14
3*x = 39/14 // : 3
x = 39/14/3
x = 13/14
x = 13/14
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