3a+21-7a=7-4a

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Solution for 3a+21-7a=7-4a equation: 



3a+21-7a=7-4a

We move all terms to the left:

3a+21-7a-(7-4a)=0

We add all the numbers together, and all the variables

3a-7a-(-4a+7)+21=0

We add all the numbers together, and all the variables

-4a-(-4a+7)+21=0

We get rid of parentheses

-4a+4a-7+21=0

We add all the numbers together, and all the variables

14!=0

There is no solution for this equation

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