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x in (-oo:+oo)
(5/7)*x = 10/14 // - 10/14
(5/7)*x-(10/14) = 0
(5/7)*x-5/7 = 0
5/7*x-5/7 = 0 // + 5/7
5/7*x = 5/7 // : 5/7
x = 5/7/5/7
x = 1
x = 1
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