3a+12=-2a-18

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Solution for 3a+12=-2a-18 equation: 



3a+12=-2a-18

We move all terms to the left:

3a+12-(-2a-18)=0

We get rid of parentheses

3a+2a+18+12=0

We add all the numbers together, and all the variables

5a+30=0

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

5a=-30

a=-30/5

a=-6

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