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4(6a+2)=20
We move all terms to the left:
4(6a+2)-(20)=0
We multiply parentheses
24a+8-20=0
We add all the numbers together, and all the variables
24a-12=0
We move all terms containing a to the left, all other terms to the right
24a=12
a=12/24
a=1/2
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