To simplify this expression, we can combine like terms.
First, let's simplify inside the parentheses:
-7t + 4t = -3t
Now, the expression becomes:
9(-3t - 10) -9t
Distribute the 9 to each term inside the parentheses:
-27t - 90 - 9t
Combine like terms:
-27t - 9t = -36t
Finally, the simplified expression is:
-36t - 90
simplify:
9(-7t+4t-10)-9t
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