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