Answer:
-6t^2+1t+5
Explanation:
(3t^2+6t)+(-9t^2-5t+5)
=3t^2+6t-9t^2-5t+5
=-6t^2+t+5
-6t^2 + t + 5
3t^2 +6t
-9t^2 -5t + 5
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