-20=a+30

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Solution for -20=a+30 equation: 



-20=a+30

We move all terms to the left:

-20-(a+30)=0

We get rid of parentheses

-a-30-20=0

We add all the numbers together, and all the variables

-1a-50=0

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

-a=50

a=50/-1

a=-50

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