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24=-6a+45-a
We move all terms to the left:
24-(-6a+45-a)=0
We add all the numbers together, and all the variables
-(-7a+45)+24=0
We get rid of parentheses
7a-45+24=0
We add all the numbers together, and all the variables
7a-21=0
We move all terms containing a to the left, all other terms to the right
7a=21
a=21/7
a=3
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