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76=-2t-(21t)
We move all terms to the left:
76-(-2t-(21t))=0
We add all the numbers together, and all the variables
-(-23t)+76=0
We get rid of parentheses
23t+76=0
We move all terms containing t to the left, all other terms to the right
23t=-76
t=-76/23
t=-3+7/23
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