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(2/2)*(12-x) = 4 // - 4
(2/2)*(12-x)-4 = 0
1*(12-x)-4 = 0
1*(12-x)-4 = 0
8-x = 0
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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