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5a-a-6a-15+7a=12-a-2a+12-3a
We move all terms to the left:
5a-a-6a-15+7a-(12-a-2a+12-3a)=0
We add all the numbers together, and all the variables
5a-a-6a+7a-(-6a+24)-15=0
We add all the numbers together, and all the variables
5a-(-6a+24)-15=0
We get rid of parentheses
5a+6a-24-15=0
We add all the numbers together, and all the variables
11a-39=0
We move all terms containing a to the left, all other terms to the right
11a=39
a=39/11
a=3+6/11
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