3a+21=-33

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Solution for 3a+21=-33 equation: 



3a+21=-33

We move all terms to the left:

3a+21-(-33)=0

We add all the numbers together, and all the variables

3a+54=0

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

3a=-54

a=-54/3

a=-18

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