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(1/2)*(12*x+16) = 56 // - 56
(1/2)*(12*x+16)-56 = 0
1/2*(12*x+16)-56 = 0
1/2*(12*x+16)-56 = 0
6*x-48 = 0
6*x-48 = 0
6*x-48 = 0 // + 48
6*x = 48 // : 6
x = 48/6
x = 8
x = 8
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