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(360-x-x)/2 = 104 // - 104
(360-x-x)/2-104 = 0
(360-2*x)/2-104 = 0
(360-2*x)/2+(-104*2)/2 = 0
360-2*x-104*2 = 0
152-2*x = 0
(152-2*x)/2 = 0
(152-2*x)/2 = 0 // * 2
152-2*x = 0
152-2*x = 0 // - 152
-2*x = -152 // : -2
x = -152/(-2)
x = 76
x = 76
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