20=-a+2

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Solution for 20=-a+2 equation: 



20=-a+2

We move all terms to the left:

20-(-a+2)=0

We add all the numbers together, and all the variables

-(-1a+2)+20=0

We get rid of parentheses

1a-2+20=0

We add all the numbers together, and all the variables

a+18=0

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

a=-18

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