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t in (-oo:+oo)
-4/15 = -t/12 // + -t/12
-(-t/12)-4/15 = 0
(1/12)*t-4/15 = 0
1/12*t-4/15 = 0 // + 4/15
1/12*t = 4/15 // : 1/12
t = 4/15/1/12
t = 16/5
t = 16/5
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