15=a-4

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Solution for 15=a-4 equation: 



15=a-4

We move all terms to the left:

15-(a-4)=0

We get rid of parentheses

-a+4+15=0

We add all the numbers together, and all the variables

-1a+19=0

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

-a=-19

a=-19/-1

a=+19

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