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