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(5/8)*(x-3) = 8*(6-x) // - 8*(6-x)
(5/8)*(x-3)-(8*(6-x)) = 0
(5/8)*(x-3)-8*(6-x) = 0
5/8*(x-3)-8*(6-x) = 0
5/8*(x-3)-8*(6-x) = 0
69/8*x-399/8 = 0
69/8*x-399/8 = 0
69/8*x-399/8 = 0 // + 399/8
69/8*x = 399/8 // : 69/8
x = 399/8/69/8
x = 133/23
x = 133/23
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