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x in (-oo:+oo)
x+6/7 = 10/7-x // - 10/7-x
x+x+6/7-(10/7) = 0
x+x+6/7-10/7 = 0
2*x-4/7 = 0 // + 4/7
2*x = 4/7 // : 2
x = 4/7/2
x = 2/7
x = 2/7
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