a+21+2a=7-4a

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Solution for a+21+2a=7-4a equation: 



a+21+2a=7-4a

We move all terms to the left:

a+21+2a-(7-4a)=0

We add all the numbers together, and all the variables

a+2a-(-4a+7)+21=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a+4a-7+21=0

We add all the numbers together, and all the variables

7a+14=0

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

7a=-14

a=-14/7

a=-2

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