3(a-7)=4a

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Solution for 3(a-7)=4a equation: 



3(a-7)=4a

We move all terms to the left:

3(a-7)-(4a)=0

We add all the numbers together, and all the variables

-4a+3(a-7)=0

We multiply parentheses

-4a+3a-21=0

We add all the numbers together, and all the variables

-1a-21=0

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

-a=21

a=21/-1

a=-21

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