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x+x-(7/7)+2/5 = 9/7 // - 9/7
x+x-(7/7)+2/5-(9/7) = 0
x+x+2/5-9/7-1 = 0
2*x-66/35 = 0 // + 66/35
2*x = 66/35 // : 2
x = 66/35/2
x = 33/35
x = 33/35
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