28=-5a-12

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Solution for 28=-5a-12 equation: 



28=-5a-12

We move all terms to the left:

28-(-5a-12)=0

We get rid of parentheses

5a+12+28=0

We add all the numbers together, and all the variables

5a+40=0

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

5a=-40

a=-40/5

a=-8

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