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t in (-oo:+oo)
-38 = t+7*t+2 // - t+7*t+2
-t-(7*t)-38-2 = 0
-t-7*t-38-2 = 0
-8*t-40 = 0 // + 40
-8*t = 40 // : -8
t = 40/(-8)
t = -5
t = -5
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