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7*x-4*x+7 = 23/3 // - 23/3
7*x-4*x-(23/3)+7 = 0
7*x-4*x-23/3+7 = 0
3*x-2/3 = 0 // + 2/3
3*x = 2/3 // : 3
x = 2/3/3
x = 2/9
x = 2/9
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