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(3*x)/6 = 12/4 // - 12/4
(3*x)/6-(12/4) = 0
(3*x)/6-3 = 0
1/2*x-3 = 0 // + 3
1/2*x = 3 // : 1/2
x = 3/1/2
x = 6
x = 6
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