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x in (-oo:+oo)
8*x = 4/7 // - 4/7
8*x-(4/7) = 0
8*x-4/7 = 0
8*x-4/7 = 0 // + 4/7
8*x = 4/7 // : 8
x = 4/7/8
x = 1/14
x = 1/14
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