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(1/2)*x+7/12 = 5/12 // - 5/12
(1/2)*x+7/12-(5/12) = 0
(1/2)*x+7/12-5/12 = 0
1/2*x+1/6 = 0 // - 1/6
1/2*x = -1/6 // : 1/2
x = -1/6/1/2
x = -1/3
x = -1/3
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