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x in (-oo:+oo)
(pi/2)*x = pi/220 // - pi/220
(pi/2)*x-(pi/220) = 0
(pi/2)*x-(pi/220) = 0 // + pi/220
(pi/2)*x = pi/220 // : pi/2
x = (pi/220)/(pi/2)
x = 1/110
x = 1/110
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