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(4*(x-2))/5 = 20 // - 20
(4*(x-2))/5-20 = 0
(4*(x-2))/5+(-20*5)/5 = 0
4*(x-2)-20*5 = 0
4*x-108 = 0
(4*x-108)/5 = 0
(4*x-108)/5 = 0 // * 5
4*x-108 = 0
4*x-108 = 0 // + 108
4*x = 108 // : 4
x = 108/4
x = 27
x = 27
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