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(5*x)/6+2/3 = 57/12 // - 57/12
(5*x)/6+2/3-(57/12) = 0
(5*x)/6+2/3-19/4 = 0
5/6*x-49/12 = 0 // + 49/12
5/6*x = 49/12 // : 5/6
x = 49/12/5/6
x = 49/10
x = 49/10
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