a+4-4a=-a-20

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



a+4-4a=-a-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-3a-(-1a-20)+4=0

We get rid of parentheses

-3a+1a+20+4=0

We add all the numbers together, and all the variables

-2a+24=0

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

-2a=-24

a=-24/-2

a=+12

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