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(1/2)*(116-x) = 20 // - 20
(1/2)*(116-x)-20 = 0
1/2*(116-x)-20 = 0
1/2*(116-x)-20 = 0
38-1/2*x = 0
38-1/2*x = 0
38-1/2*x = 0 // - 38
-1/2*x = -38 // : -1/2
x = -38/(-1/2)
x = 76
x = 76
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