171=-9-9x

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Solution for 171=-9-9x equation: 



171=-9-9x

We move all terms to the left:

171-(-9-9x)=0

We add all the numbers together, and all the variables

-(-9x-9)+171=0

We get rid of parentheses

9x+9+171=0

We add all the numbers together, and all the variables

9x+180=0

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

9x=-180

x=-180/9

x=-20

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