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t in (-oo:+oo)
-(2*t)-7 = -27 // + 27
27-(2*t)-7 = 0
27-2*t-7 = 0
20-2*t = 0 // - 20
-2*t = -20 // : -2
t = -20/(-2)
t = 10
t = 10
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