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(8*x-1)/2-(2*x) = 3 // - 3
(8*x-1)/2-(2*x)-3 = 0
(8*x-1)/2-2*x-3 = 0
(8*x-1)/2+(-2*2*x)/2+(-3*2)/2 = 0
8*x-2*2*x-3*2-1 = 0
4*x-6-1 = 0
4*x-7 = 0
(4*x-7)/2 = 0
(4*x-7)/2 = 0 // * 2
4*x-7 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x = 7/4
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