3(a+7)=7a+21

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



3(a+7)=7a+21

We move all terms to the left:

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

We multiply parentheses

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

We get rid of parentheses

3a-7a-21+21=0

We add all the numbers together, and all the variables

-4a=0

a=0/-4

a=0

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