2(a+21)=13a=20

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Solution for 2(a+21)=13a=20 equation: 



2(a+21)=13a=20

We move all terms to the left:

2(a+21)-(13a)=0

We add all the numbers together, and all the variables

-13a+2(a+21)=0

We multiply parentheses

-13a+2a+42=0

We add all the numbers together, and all the variables

-11a+42=0

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

-11a=-42

a=-42/-11

a=3+9/11

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