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6*x+4*x-(4/5)+6/2 = 31 // - 31
6*x+4*x-(4/5)+6/2-31 = 0
6*x+4*x-4/5+6/2-31 = 0
10*x-144/5 = 0 // + 144/5
10*x = 144/5 // : 10
x = 144/5/10
x = 72/25
x = 72/25
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