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t in (-oo:+oo)
-(7*t)-(4*t)-7 = -29 // + 29
29-(7*t)-(4*t)-7 = 0
29-7*t-4*t-7 = 0
22-11*t = 0 // - 22
-11*t = -22 // : -11
t = -22/(-11)
t = 2
t = 2
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