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2(6-2a)=28
We move all terms to the left:
2(6-2a)-(28)=0
We add all the numbers together, and all the variables
2(-2a+6)-28=0
We multiply parentheses
-4a+12-28=0
We add all the numbers together, and all the variables
-4a-16=0
We move all terms containing a to the left, all other terms to the right
-4a=16
a=16/-4
a=-4
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