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5*x+4*x-8/9 = 802/9 // - 802/9
5*x+4*x-8/9-(802/9) = 0
5*x+4*x-8/9-802/9 = 0
9*x-90 = 0 // + 90
9*x = 90 // : 9
x = 90/9
x = 10
x = 10
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