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x+x-(1/4)+2/5 = 39/50 // - 39/50
x+x-(1/4)+2/5-(39/50) = 0
x+x-1/4+2/5-39/50 = 0
2*x-63/100 = 0 // + 63/100
2*x = 63/100 // : 2
x = 63/100/2
x = 63/200
x = 63/200
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