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-7a=a-24
We move all terms to the left:
-7a-(a-24)=0
We get rid of parentheses
-7a-a+24=0
We add all the numbers together, and all the variables
-8a+24=0
We move all terms containing a to the left, all other terms to the right
-8a=-24
a=-24/-8
a=+3
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