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t in (-oo:+oo)
-5 = 7*t+4*t+6 // - 7*t+4*t+6
-(7*t)-(4*t)-6-5 = 0
-7*t-4*t-6-5 = 0
-11*t-11 = 0 // + 11
-11*t = 11 // : -11
t = 11/(-11)
t = -1
t = -1
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