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x in (-oo:+oo)
2*x-(pi/2) = 2*pi // - 2*pi
2*x-(pi/2)-(2*pi) = 0
2*x-(pi/2)-2*pi = 0
2*x-5/2*pi = 0 // + -5/2*pi
2*x = -(-5/2*pi) // : 2
x = (-(-5/2*pi))/2
x = 5/4*pi
x = 5/4*pi
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