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t in (-oo:+oo)
(1/3)*(t+6)+27 = 0
1/3*(t+6)+27 = 0
1/3*(t+6)+27 = 0
1/3*t+29 = 0
1/3*t+29 = 0
1/3*t+29 = 0 // - 29
1/3*t = -29 // : 1/3
t = -29/1/3
t = -87
t = -87
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