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(0.6/2)*(0.5/2)*pi*x = 38 // - 38
(0.6/2)*(0.5/2)*pi*x-38 = 0
0.075*pi*x-38 = 0 // + 38
0.075*pi*x = 38 // : 0.075*pi
x = 38/(0.075*pi)
x = 506.66666667*pi^-1
x = 506.66666667*pi^-1
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