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