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x in (-oo:+oo)
0.035*pi*((4*x)/3) = 0.1 // - 0.1
0.035*pi*((4*x)/3)-0.1 = 0
0.04666667*pi*x-0.1 = 0 // + 0.1
0.04666667*pi*x = 0.1 // : 0.04666667*pi
x = 0.1/(0.04666667*pi)
x = 2.14285699*pi^-1
x = 2.14285699*pi^-1
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