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2a+5a+5a+4a+5a+3a=720
We move all terms to the left:
2a+5a+5a+4a+5a+3a-(720)=0
We add all the numbers together, and all the variables
24a-720=0
We move all terms containing a to the left, all other terms to the right
24a=720
a=720/24
a=30
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