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(104-x)/7 = 12 // - 12
(104-x)/7-12 = 0
(104-x)/7+(-12*7)/7 = 0
104-x-12*7 = 0
20-x = 0
(20-x)/7 = 0
(20-x)/7 = 0 // * 7
20-x = 0
20-x = 0 // - 20
-x = -20 // * -1
x = 20
x = 20
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