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x in (-oo:+oo)
(2*x)/7 = 40/35 // - 40/35
(2*x)/7-(40/35) = 0
(2*x)/7-8/7 = 0
2/7*x-8/7 = 0 // + 8/7
2/7*x = 8/7 // : 2/7
x = 8/7/2/7
x = 4
x = 4
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