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(1/2)*(238-x) = 58 // - 58
(1/2)*(238-x)-58 = 0
1/2*(238-x)-58 = 0
1/2*(238-x)-58 = 0
61-1/2*x = 0
61-1/2*x = 0
61-1/2*x = 0 // - 61
-1/2*x = -61 // : -1/2
x = -61/(-1/2)
x = 122
x = 122
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