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x in (-oo:+oo)
x/8 = 5/7 // - 5/7
x/8-(5/7) = 0
x/8-5/7 = 0
1/8*x-5/7 = 0 // + 5/7
1/8*x = 5/7 // : 1/8
x = 5/7/1/8
x = 40/7
x = 40/7
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