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(1/2)*(5*x-4) = 8 // - 8
(1/2)*(5*x-4)-8 = 0
1/2*(5*x-4)-8 = 0
1/2*(5*x-4)-8 = 0
5/2*x-10 = 0
5/2*x-10 = 0
5/2*x-10 = 0 // + 10
5/2*x = 10 // : 5/2
x = 10/5/2
x = 4
x = 4
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