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x in (-oo:+oo)
(2*x)/5 = 8/7 // - 8/7
(2*x)/5-(8/7) = 0
(2*x)/5-8/7 = 0
2/5*x-8/7 = 0 // + 8/7
2/5*x = 8/7 // : 2/5
x = 8/7/2/5
x = 20/7
x = 20/7
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