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t in (-oo:+oo)
-(2*t)-(7*t)-9 = -54 // + 54
54-(2*t)-(7*t)-9 = 0
54-2*t-7*t-9 = 0
45-9*t = 0 // - 45
-9*t = -45 // : -9
t = -45/(-9)
t = 5
t = 5
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