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-4a+16+8a=2a-6a
We move all terms to the left:
-4a+16+8a-(2a-6a)=0
We add all the numbers together, and all the variables
-4a+8a-(-4a)+16=0
We add all the numbers together, and all the variables
4a-(-4a)+16=0
We get rid of parentheses
4a+4a+16=0
We add all the numbers together, and all the variables
8a+16=0
We move all terms containing a to the left, all other terms to the right
8a=-16
a=-16/8
a=-2
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