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6*x+(2/3)*x+10 = 250/3 // - 250/3
6*x+(2/3)*x-(250/3)+10 = 0
6*x+(2/3)*x-250/3+10 = 0
20/3*x-220/3 = 0 // + 220/3
20/3*x = 220/3 // : 20/3
x = 220/3/20/3
x = 11
x = 11
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