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t in (-oo:+oo)
t/9+1/3 = -2 // + 2
t/9+1/3+2 = 0
1/9*t+7/3 = 0 // - 7/3
1/9*t = -7/3 // : 1/9
t = -7/3/1/9
t = -21
t = -21
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