-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 add all the numbers together, and all the variables

-(-1a+4)-15=0

We get rid of parentheses

1a-4-15=0

We add all the numbers together, and all the variables

a-19=0

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

a=19

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