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12a=10a-38
We move all terms to the left:
12a-(10a-38)=0
We get rid of parentheses
12a-10a+38=0
We add all the numbers together, and all the variables
2a+38=0
We move all terms containing a to the left, all other terms to the right
2a=-38
a=-38/2
a=-19
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