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t+10=2t+9
We move all terms to the left:
t+10-(2t+9)=0
We get rid of parentheses
t-2t-9+10=0
We add all the numbers together, and all the variables
-1t+1=0
We move all terms containing t to the left, all other terms to the right
-t=-1
t=-1/-1
t=1
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