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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

2a+3a-6a-a-32=0

We add all the numbers together, and all the variables

-2a-32=0

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

-2a=32

a=32/-2

a=-16

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