-1=9+7x

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Solution for -1=9+7x equation: 



-1=9+7x

We move all terms to the left:

-1-(9+7x)=0

We add all the numbers together, and all the variables

-(7x+9)-1=0

We get rid of parentheses

-7x-9-1=0

We add all the numbers together, and all the variables

-7x-10=0

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

-7x=10

x=10/-7

x=-1+3/7

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