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(5/6)*x+1/8 = 21/8 // - 21/8
(5/6)*x+1/8-(21/8) = 0
(5/6)*x+1/8-21/8 = 0
5/6*x-5/2 = 0 // + 5/2
5/6*x = 5/2 // : 5/6
x = 5/2/5/6
x = 3
x = 3
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