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(1/2)*x+2/3 = 31/6 // - 31/6
(1/2)*x+2/3-(31/6) = 0
(1/2)*x+2/3-31/6 = 0
1/2*x-9/2 = 0 // + 9/2
1/2*x = 9/2 // : 1/2
x = 9/2/1/2
x = 9
x = 9
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