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t in (-oo:+oo)
(2/3)*t-((1/6)*t)+1/4 = -3/4 // + -3/4
(2/3)*t-((1/6)*t)+1/4-(-3/4) = 0
(2/3)*t+(-1/6)*t+1/4+3/4 = 0
1/2*t+1 = 0 // - 1
1/2*t = -1 // : 1/2
t = -1/1/2
t = -2
t = -2
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