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-3a-12a+5+6a-10=16-2a-7-9+2a
We move all terms to the left:
-3a-12a+5+6a-10-(16-2a-7-9+2a)=0
We add all the numbers together, and all the variables
-3a-12a+6a+5-10-0=0
We add all the numbers together, and all the variables
-9a-5=0
We move all terms containing a to the left, all other terms to the right
-9a=5
a=5/-9
a=-5/9
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