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