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+20)=0

We multiply parentheses

2a-(13a+20)+42=0

We get rid of parentheses

2a-13a-20+42=0

We add all the numbers together, and all the variables

-11a+22=0

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

-11a=-22

a=-22/-11

a=+2

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