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x in (-oo:+oo)
(2/7)*x = 343/8 // - 343/8
(2/7)*x-(343/8) = 0
(2/7)*x-343/8 = 0
2/7*x-343/8 = 0 // + 343/8
2/7*x = 343/8 // : 2/7
x = 343/8/2/7
x = 2401/16
x = 2401/16
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