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t in (-oo:+oo)
(1/4)*(t+6) = 5 // - 5
(1/4)*(t+6)-5 = 0
1/4*(t+6)-5 = 0
1/4*(t+6)-5 = 0
1/4*t-7/2 = 0
1/4*t-7/2 = 0
1/4*t-7/2 = 0 // + 7/2
1/4*t = 7/2 // : 1/4
t = 7/2/1/4
t = 14
t = 14
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