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(1/4)*(2*x-1) = 6 // - 6
(1/4)*(2*x-1)-6 = 0
1/4*(2*x-1)-6 = 0
1/4*(2*x-1)-6 = 0
1/2*x-25/4 = 0
1/2*x-25/4 = 0
1/2*x-25/4 = 0 // + 25/4
1/2*x = 25/4 // : 1/2
x = 25/4/1/2
x = 25/2
x = 25/2
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