12=-5a-3

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Solution for 12=-5a-3 equation: 



12=-5a-3

We move all terms to the left:

12-(-5a-3)=0

We get rid of parentheses

5a+3+12=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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