21-3(a-7)=(a+20)

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Solution for 21-3(a-7)=(a+20) equation: 



21-3(a-7)=(a+20)

We move all terms to the left:

21-3(a-7)-((a+20))=0

We multiply parentheses

-3a-((a+20))+21+21=0



We calculate terms in parentheses: -((a+20)), so:

(a+20)

We get rid of parentheses

a+20

Back to the equation:

-(a+20)



We add all the numbers together, and all the variables

-3a-(a+20)+42=0

We get rid of parentheses

-3a-a-20+42=0

We add all the numbers together, and all the variables

-4a+22=0

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

-4a=-22

a=-22/-4

a=5+1/2

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