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t in (-oo:+oo)
(-1/2)*t = -1/18 // + -1/18
(-1/2)*t-(-1/18) = 0
(-1/2)*t+1/18 = 0
1/18-1/2*t = 0 // - 1/18
-1/2*t = -1/18 // : -1/2
t = -1/18/(-1/2)
t = 1/9
t = 1/9
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