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(1/4)*(2*x-1) = 8 // - 8
(1/4)*(2*x-1)-8 = 0
1/4*(2*x-1)-8 = 0
1/4*(2*x-1)-8 = 0
1/2*x-33/4 = 0
1/2*x-33/4 = 0
1/2*x-33/4 = 0 // + 33/4
1/2*x = 33/4 // : 1/2
x = 33/4/1/2
x = 33/2
x = 33/2
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