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x in (-oo:+oo)
3.14*(x/2) = 16 // - 16
3.14*(x/2)-16 = 0
1.57*x-16 = 0 // + 16
1.57*x = 16 // : 1.57
x = 16/1.57
x = 10.1910828
x = 10.1910828
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