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648=35t+85t
We move all terms to the left:
648-(35t+85t)=0
We add all the numbers together, and all the variables
-(+120t)+648=0
We get rid of parentheses
-120t+648=0
We move all terms containing t to the left, all other terms to the right
-120t=-648
t=-648/-120
t=5+2/5
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