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3*x+x+24/4+17/7 = 12 // - 12
3*x+x+24/4+17/7-12 = 0
4*x-25/7 = 0 // + 25/7
4*x = 25/7 // : 4
x = 25/7/4
x = 25/28
x = 25/28
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