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-12a+3a+15=9-12+a
We move all terms to the left:
-12a+3a+15-(9-12+a)=0
We add all the numbers together, and all the variables
-12a+3a-(a-3)+15=0
We add all the numbers together, and all the variables
-9a-(a-3)+15=0
We get rid of parentheses
-9a-a+3+15=0
We add all the numbers together, and all the variables
-10a+18=0
We move all terms containing a to the left, all other terms to the right
-10a=-18
a=-18/-10
a=1+4/5
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