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(2*x+7)/5 = 12 // - 12
(2*x+7)/5-12 = 0
(2*x+7)/5+(-12*5)/5 = 0
2*x-12*5+7 = 0
2*x-53 = 0
(2*x-53)/5 = 0
(2*x-53)/5 = 0 // * 5
2*x-53 = 0
2*x-53 = 0 // + 53
2*x = 53 // : 2
x = 53/2
x = 53/2
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