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x in (-oo:+oo)
(5/7)*x = 25/14 // - 25/14
(5/7)*x-(25/14) = 0
(5/7)*x-25/14 = 0
5/7*x-25/14 = 0 // + 25/14
5/7*x = 25/14 // : 5/7
x = 25/14/5/7
x = 5/2
x = 5/2
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