-20=a-18

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Solution for -20=a-18 equation: 



-20=a-18

We move all terms to the left:

-20-(a-18)=0

We get rid of parentheses

-a+18-20=0

We add all the numbers together, and all the variables

-1a-2=0

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

-a=2

a=2/-1

a=-2

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