-9=7x+40

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Solution for -9=7x+40 equation: 



-9=7x+40

We move all terms to the left:

-9-(7x+40)=0

We get rid of parentheses

-7x-40-9=0

We add all the numbers together, and all the variables

-7x-49=0

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

-7x=49

x=49/-7

x=-7

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