5a-21=-6

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Solution for 5a-21=-6 equation: 



5a-21=-6

We move all terms to the left:

5a-21-(-6)=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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