2(4a+20)=21

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Solution for 2(4a+20)=21 equation: 



2(4a+20)=21

We move all terms to the left:

2(4a+20)-(21)=0

We multiply parentheses

8a+40-21=0

We add all the numbers together, and all the variables

8a+19=0

We move all terms containing a to the left, all other terms to the right

8a=-19

a=-19/8

a=-2+3/8

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