20=-a+4

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Solution for 20=-a+4 equation: 



20=-a+4

We move all terms to the left:

20-(-a+4)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1a-4+20=0

We add all the numbers together, and all the variables

a+16=0

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

a=-16

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