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7*x-3*x+4/9 = 220/9 // - 220/9
7*x-3*x+4/9-(220/9) = 0
7*x-3*x+4/9-220/9 = 0
4*x-24 = 0 // + 24
4*x = 24 // : 4
x = 24/4
x = 6
x = 6
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