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a+5+2a-1+3a-1=24
We move all terms to the left:
a+5+2a-1+3a-1-(24)=0
We add all the numbers together, and all the variables
6a-21=0
We move all terms containing a to the left, all other terms to the right
6a=21
a=21/6
a=3+1/2
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