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x in (-oo:+oo)
(2*x)/7 = 14/20 // - 14/20
(2*x)/7-(14/20) = 0
(2*x)/7-7/10 = 0
2/7*x-7/10 = 0 // + 7/10
2/7*x = 7/10 // : 2/7
x = 7/10/2/7
x = 49/20
x = 49/20
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