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t in (-oo:+oo)
-t/4 = 3*pi // - 3*pi
-t/4-(3*pi) = 0
-t/4-3*pi = 0
-1/4*t-3*pi = 0 // + -3*pi
-1/4*t = -(-3*pi) // : -1/4
t = (-(-3*pi))/(-1/4)
t = -12*pi
t = -12*pi
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