-25=-15+a

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Solution for -25=-15+a equation: 



-25=-15+a

We move all terms to the left:

-25-(-15+a)=0

We add all the numbers together, and all the variables

-(a-15)-25=0

We get rid of parentheses

-a+15-25=0

We add all the numbers together, and all the variables

-1a-10=0

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

-a=10

a=10/-1

a=-10

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