-15-a=-20+4a

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Solution for -15-a=-20+4a equation: 



-15-a=-20+4a

We move all terms to the left:

-15-a-(-20+4a)=0

We add all the numbers together, and all the variables

-a-(4a-20)-15=0

We add all the numbers together, and all the variables

-1a-(4a-20)-15=0

We get rid of parentheses

-1a-4a+20-15=0

We add all the numbers together, and all the variables

-5a+5=0

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

-5a=-5

a=-5/-5

a=1

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