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x+x+3/10-(8/5)-(9/7) = 0
x+x+3/10-8/5-9/7 = 0
2*x-181/70 = 0 // + 181/70
2*x = 181/70 // : 2
x = 181/70/2
x = 181/140
x = 181/140
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