-20=(10-3x)(7)-9x

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Solution for -20=(10-3x)(7)-9x equation: 



-20=(10-3x)(7)-9x

We move all terms to the left:

-20-((10-3x)(7)-9x)=0

We add all the numbers together, and all the variables

-((-3x+10)7-9x)-20=0



We calculate terms in parentheses: -((-3x+10)7-9x), so:

(-3x+10)7-9x

We add all the numbers together, and all the variables

-9x+(-3x+10)7

We multiply parentheses

-9x-21x+70

We add all the numbers together, and all the variables

-30x+70

Back to the equation:

-(-30x+70)



We get rid of parentheses

30x-70-20=0

We add all the numbers together, and all the variables

30x-90=0

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

30x=90

x=90/30

x=3

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