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t in (-oo:+oo)
(1/3)*t+1/6 = -5/6 // + -5/6
(1/3)*t+1/6-(-5/6) = 0
(1/3)*t+1/6+5/6 = 0
1/3*t+1 = 0 // - 1
1/3*t = -1 // : 1/3
t = -1/1/3
t = -3
t = -3
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