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t in (-oo:+oo)
(1/4)*(3*t+27) = (3/4)*(3*t+15) // - (3/4)*(3*t+15)
(1/4)*(3*t+27)-((3/4)*(3*t+15)) = 0
(1/4)*(3*t+27)+(-3/4)*(3*t+15) = 0
1/4*(3*t+27)-3/4*(3*t+15) = 0
1/4*(3*t+27)-3/4*(3*t+15) = 0
-3/2*t-9/2 = 0
-3/2*t-9/2 = 0
-3/2*t-9/2 = 0 // + 9/2
-3/2*t = 9/2 // : -3/2
t = 9/2/(-3/2)
t = -3
t = -3
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