25=-7-8a

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Solution for 25=-7-8a equation: 



25=-7-8a

We move all terms to the left:

25-(-7-8a)=0

We add all the numbers together, and all the variables

-(-8a-7)+25=0

We get rid of parentheses

8a+7+25=0

We add all the numbers together, and all the variables

8a+32=0

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

8a=-32

a=-32/8

a=-4

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