-99=3x+7x-9

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Solution for -99=3x+7x-9 equation: 



-99=3x+7x-9

We move all terms to the left:

-99-(3x+7x-9)=0

We add all the numbers together, and all the variables

-(10x-9)-99=0

We get rid of parentheses

-10x+9-99=0

We add all the numbers together, and all the variables

-10x-90=0

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

-10x=90

x=90/-10

x=-9

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