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(1/2)*(8*x-16) = 12 // - 12
(1/2)*(8*x-16)-12 = 0
1/2*(8*x-16)-12 = 0
1/2*(8*x-16)-12 = 0
4*x-20 = 0
4*x-20 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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