15-a-4=-28

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Solution for 15-a-4=-28 equation: 



15-a-4=-28

We move all terms to the left:

15-a-4-(-28)=0

We add all the numbers together, and all the variables

-1a+39=0

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

-a=-39

a=-39/-1

a=+39

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