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t in (-oo:+oo)
-2*t-4 = 7*t+14 // - 7*t+14
-2*t-(7*t)-14-4 = 0
-2*t-7*t-14-4 = 0
-9*t-18 = 0 // + 18
-9*t = 18 // : -9
t = 18/(-9)
t = -2
t = -2
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