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|2 - |t-1|| > 10
a) 2- |t-1| > 10
-8 > |t-1| -> niemożliwe, bo prawa strona jest zawsze nieujemna
b) 2-|t-1| < -10
12 < |t-1|
b,1) 12 < t-1
t > 13
b,2) -12>t-1
-11 > t
t∈(-∞,-11)U(13,∞)