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3*x+x+14/5+28/7 = 12 // - 12
3*x+x+14/5+28/7-12 = 0
4*x-26/5 = 0 // + 26/5
4*x = 26/5 // : 4
x = 26/5/4
x = 13/10
x = 13/10
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