-20=7-9x

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Solution for -20=7-9x equation: 



-20=7-9x

We move all terms to the left:

-20-(7-9x)=0

We add all the numbers together, and all the variables

-(-9x+7)-20=0

We get rid of parentheses

9x-7-20=0

We add all the numbers together, and all the variables

9x-27=0

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

9x=27

x=27/9

x=3

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