a-7=8+4a

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Solution for a-7=8+4a equation: 



a-7=8+4a

We move all terms to the left:

a-7-(8+4a)=0

We add all the numbers together, and all the variables

a-(4a+8)-7=0

We get rid of parentheses

a-4a-8-7=0

We add all the numbers together, and all the variables

-3a-15=0

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

-3a=15

a=15/-3

a=-5

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