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301.44 = (3.14*18*x)/3 // - (3.14*18*x)/3
301.44-((3.14*18*x)/3) = 0
301.44-18.84*x = 0
301.44-18.84*x = 0 // - 301.44
-18.84*x = -301.44 // : -18.84
x = -301.44/(-18.84)
x = 16
x = 16
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