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t in (-oo:+oo)
(-2/3)*t+7*t+1/2 = 41/6 // - 41/6
(-2/3)*t+7*t+1/2-(41/6) = 0
(-2/3)*t+7*t+1/2-41/6 = 0
19/3*t-19/3 = 0 // + 19/3
19/3*t = 19/3 // : 19/3
t = 19/3/19/3
t = 1
t = 1
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