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t in (-oo:+oo)
-2/15 = -t/12 // + -t/12
-(-t/12)-2/15 = 0
(1/12)*t-2/15 = 0
1/12*t-2/15 = 0 // + 2/15
1/12*t = 2/15 // : 1/12
t = 2/15/1/12
t = 8/5
t = 8/5
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