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