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(42-x)/2 = 16 // - 16
(42-x)/2-16 = 0
(42-x)/2+(-16*2)/2 = 0
42-x-16*2 = 0
10-x = 0
(10-x)/2 = 0
(10-x)/2 = 0 // * 2
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x = 10
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