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13=9t+4t
We move all terms to the left:
13-(9t+4t)=0
We add all the numbers together, and all the variables
-(+13t)+13=0
We get rid of parentheses
-13t+13=0
We move all terms containing t to the left, all other terms to the right
-13t=-13
t=-13/-13
t=1
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