Answer:
12t² - 9t - 2
Explanation:
Combine like terms. Like terms have same variable with same exponents.
(7t² - 6t-4) + (5t² - 3t+2) = 7t² - 6t-4 + 5t² - 3t+2
= 7t² + 5t² - 6t - 3t - 4 + 2
= 12t² - 9t - 2
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