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x in (-oo:+oo)
(2/7)*x = 5/8 // - 5/8
(2/7)*x-(5/8) = 0
(2/7)*x-5/8 = 0
2/7*x-5/8 = 0 // + 5/8
2/7*x = 5/8 // : 2/7
x = 5/8/2/7
x = 35/16
x = 35/16
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