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x in (-oo:+oo)
(5/7)*x = 13/14 // - 13/14
(5/7)*x-(13/14) = 0
(5/7)*x-13/14 = 0
5/7*x-13/14 = 0 // + 13/14
5/7*x = 13/14 // : 5/7
x = 13/14/5/7
x = 13/10
x = 13/10
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