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