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6a-12=7+5a
We move all terms to the left:
6a-12-(7+5a)=0
We add all the numbers together, and all the variables
6a-(5a+7)-12=0
We get rid of parentheses
6a-5a-7-12=0
We add all the numbers together, and all the variables
a-19=0
We move all terms containing a to the left, all other terms to the right
a=19
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