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2(4a+2)=21a
We move all terms to the left:
2(4a+2)-(21a)=0
We add all the numbers together, and all the variables
-21a+2(4a+2)=0
We multiply parentheses
-21a+8a+4=0
We add all the numbers together, and all the variables
-13a+4=0
We move all terms containing a to the left, all other terms to the right
-13a=-4
a=-4/-13
a=4/13
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