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(1/2)*(140-x) = 40 // - 40
(1/2)*(140-x)-40 = 0
1/2*(140-x)-40 = 0
1/2*(140-x)-40 = 0
30-1/2*x = 0
30-1/2*x = 0
30-1/2*x = 0 // - 30
-1/2*x = -30 // : -1/2
x = -30/(-1/2)
x = 60
x = 60
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