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(113-x)/2 = 30 // - 30
(113-x)/2-30 = 0
(113-x)/2+(-30*2)/2 = 0
113-x-30*2 = 0
53-x = 0
(53-x)/2 = 0
(53-x)/2 = 0 // * 2
53-x = 0
53-x = 0 // - 53
-x = -53 // * -1
x = 53
x = 53
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