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-15=9-2t
We move all terms to the left:
-15-(9-2t)=0
We add all the numbers together, and all the variables
-(-2t+9)-15=0
We get rid of parentheses
2t-9-15=0
We add all the numbers together, and all the variables
2t-24=0
We move all terms containing t to the left, all other terms to the right
2t=24
t=24/2
t=12
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