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t in (-oo:+oo)
18 = (-1/2)*t // - (-1/2)*t
18-((-1/2)*t) = 0
(1/2)*t+18 = 0
1/2*t+18 = 0 // - 18
1/2*t = -18 // : 1/2
t = -18/1/2
t = -36
t = -36
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