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8*x-(8*((6*13)/8)) = 30 // - 30
8*x-(8*((6*13)/8))-30 = 0
8*x-78-30 = 0
8*x-108 = 0 // + 108
8*x = 108 // : 8
x = 108/8
x = 27/2
x = 27/2
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