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(1/8)*(x-40) = 7/9 // - 7/9
(1/8)*(x-40)-(7/9) = 0
(1/8)*(x-40)-7/9 = 0
1/8*(x-40)-7/9 = 0
(1/8*9*(x-40))/9-7/9 = 0
1/8*9*(x-40)-7 = 0
9/8*x-52 = 0
(9/8*x-52)/9 = 0
(9/8*x-52)/9 = 0 // * 9
9/8*x-52 = 0
9/8*x-52 = 0 // + 52
9/8*x = 52 // : 9/8
x = 52/9/8
x = 416/9
x = 416/9
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