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-2(2a+1)=26
We move all terms to the left:
-2(2a+1)-(26)=0
We multiply parentheses
-4a-2-26=0
We add all the numbers together, and all the variables
-4a-28=0
We move all terms containing a to the left, all other terms to the right
-4a=28
a=28/-4
a=-7
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