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x in (-oo:+oo)
x+x-(5/7)+8/5 = 8/7 // - 8/7
x+x-(5/7)+8/5-(8/7) = 0
x+x-5/7+8/5-8/7 = 0
2*x-9/35 = 0 // + 9/35
2*x = 9/35 // : 2
x = 9/35/2
x = 9/70
x = 9/70
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