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6=2(2a+1)
We move all terms to the left:
6-(2(2a+1))=0
We calculate terms in parentheses: -(2(2a+1)), so:We get rid of parentheses
2(2a+1)
We multiply parentheses
4a+2
Back to the equation:
-(4a+2)
-4a-2+6=0
We add all the numbers together, and all the variables
-4a+4=0
We move all terms containing a to the left, all other terms to the right
-4a=-4
a=-4/-4
a=1
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