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(4/2)*(2*x-1)-(2*x) = 5/2 // - 5/2
(4/2)*(2*x-1)-(2*x)-(5/2) = 0
(4/2)*(2*x-1)-2*x-5/2 = 0
2*(2*x-1)-2*x-5/2 = 0
(2^2*(2*x-1))/2+(-2*2*x)/2-5/2 = 0
2^2*(2*x-1)-2*2*x-5 = 0
4*x-5-4 = 0
4*x-9 = 0
(4*x-9)/2 = 0
(4*x-9)/2 = 0 // * 2
4*x-9 = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x = 9/4
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