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12a-6a-6a+3a+3a=18
We move all terms to the left:
12a-6a-6a+3a+3a-(18)=0
We add all the numbers together, and all the variables
6a-18=0
We move all terms containing a to the left, all other terms to the right
6a=18
a=18/6
a=3
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