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-2t+5= 5
-2t= 0
t= 0
(t-3)² - (t-2)² = 5
t²-6t+9-(t²-4t+4)= 5
t²-6t+9-t²+4t-4= 5
Se va t²:
-6t+9+4t-4= 5
-2t+5=5
-2t=0
t= 0/-2
∴ t=0