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(3*x-1)/2 = 10 // - 10
(3*x-1)/2-10 = 0
(3*x-1)/2+(-10*2)/2 = 0
3*x-10*2-1 = 0
3*x-21 = 0
(3*x-21)/2 = 0
(3*x-21)/2 = 0 // * 2
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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