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(1/2)*(93-x) = 30 // - 30
(1/2)*(93-x)-30 = 0
1/2*(93-x)-30 = 0
1/2*(93-x)-30 = 0
33/2-1/2*x = 0
33/2-1/2*x = 0
33/2-1/2*x = 0 // - 33/2
-1/2*x = -33/2 // : -1/2
x = -33/2/(-1/2)
x = 33
x = 33
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