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3*x+x-(2/4)+34/5 = 12 // - 12
3*x+x-(2/4)+34/5-12 = 0
3*x+x-1/2+34/5-12 = 0
4*x-57/10 = 0 // + 57/10
4*x = 57/10 // : 4
x = 57/10/4
x = 57/40
x = 57/40
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