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x in (-oo:+oo)
(5*x)/2 = 4/7 // - 4/7
(5*x)/2-(4/7) = 0
(5*x)/2-4/7 = 0
5/2*x-4/7 = 0 // + 4/7
5/2*x = 4/7 // : 5/2
x = 4/7/5/2
x = 8/35
x = 8/35
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