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