15-4a=a-25

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Solution for 15-4a=a-25 equation: 



15-4a=a-25

We move all terms to the left:

15-4a-(a-25)=0

We get rid of parentheses

-4a-a+25+15=0

We add all the numbers together, and all the variables

-5a+40=0

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

-5a=-40

a=-40/-5

a=+8

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