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