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4a=12-8a
We move all terms to the left:
4a-(12-8a)=0
We add all the numbers together, and all the variables
4a-(-8a+12)=0
We get rid of parentheses
4a+8a-12=0
We add all the numbers together, and all the variables
12a-12=0
We move all terms containing a to the left, all other terms to the right
12a=12
a=12/12
a=1
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