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-45=21+t
We move all terms to the left:
-45-(21+t)=0
We add all the numbers together, and all the variables
-(t+21)-45=0
We get rid of parentheses
-t-21-45=0
We add all the numbers together, and all the variables
-1t-66=0
We move all terms containing t to the left, all other terms to the right
-t=66
t=66/-1
t=-66
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