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4+5a=6+12a
We move all terms to the left:
4+5a-(6+12a)=0
We add all the numbers together, and all the variables
5a-(12a+6)+4=0
We get rid of parentheses
5a-12a-6+4=0
We add all the numbers together, and all the variables
-7a-2=0
We move all terms containing a to the left, all other terms to the right
-7a=2
a=2/-7
a=-2/7
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