7=-20+-7x

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Solution for 7=-20+-7x equation: 



7=-20+-7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-7x)+7=0

We get rid of parentheses

7x+7=0

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

7x=-7

x=-7/7

x=-1

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