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