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(1/4)*(2*x-8) = 8 // - 8
(1/4)*(2*x-8)-8 = 0
1/4*(2*x-8)-8 = 0
1/4*(2*x-8)-8 = 0
1/2*x-10 = 0
1/2*x-10 = 0
1/2*x-10 = 0 // + 10
1/2*x = 10 // : 1/2
x = 10/1/2
x = 20
x = 20
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