5+6a+7a=-21

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Solution for 5+6a+7a=-21 equation: 



5+6a+7a=-21

We move all terms to the left:

5+6a+7a-(-21)=0

We add all the numbers together, and all the variables

13a+26=0

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

13a=-26

a=-26/13

a=-2

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