-25=3-7a

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Solution for -25=3-7a equation: 



-25=3-7a

We move all terms to the left:

-25-(3-7a)=0

We add all the numbers together, and all the variables

-(-7a+3)-25=0

We get rid of parentheses

7a-3-25=0

We add all the numbers together, and all the variables

7a-28=0

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

7a=28

a=28/7

a=4

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