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x+x-(4/4)+8/5 = 7/4 // - 7/4
x+x-(4/4)+8/5-(7/4) = 0
x+x+8/5-7/4-1 = 0
2*x-23/20 = 0 // + 23/20
2*x = 23/20 // : 2
x = 23/20/2
x = 23/40
x = 23/40
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