6a+2a=-21

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Solution for 6a+2a=-21 equation: 



6a+2a=-21

We move all terms to the left:

6a+2a-(-21)=0

We add all the numbers together, and all the variables

8a+21=0

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

8a=-21

a=-21/8

a=-2+5/8

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