9=7x+8

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Solution for 9=7x+8 equation: 



9=7x+8

We move all terms to the left:

9-(7x+8)=0

We get rid of parentheses

-7x-8+9=0

We add all the numbers together, and all the variables

-7x+1=0

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

-7x=-1

x=-1/-7

x=1/7

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