2a+3a-6a-7=21+a-4

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Solution for 2a+3a-6a-7=21+a-4 equation: 



2a+3a-6a-7=21+a-4

We move all terms to the left:

2a+3a-6a-7-(21+a-4)=0

We add all the numbers together, and all the variables

2a+3a-6a-(a+17)-7=0

We add all the numbers together, and all the variables

-1a-(a+17)-7=0

We get rid of parentheses

-1a-a-17-7=0

We add all the numbers together, and all the variables

-2a-24=0

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

-2a=24

a=24/-2

a=-12

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