50=3x-7(-x-20)

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Solution for 50=3x-7(-x-20) equation: 



50=3x-7(-x-20)

We move all terms to the left:

50-(3x-7(-x-20))=0

We add all the numbers together, and all the variables

-(3x-7(-1x-20))+50=0



We calculate terms in parentheses: -(3x-7(-1x-20)), so:

3x-7(-1x-20)

We multiply parentheses

3x+7x+140

We add all the numbers together, and all the variables

10x+140

Back to the equation:

-(10x+140)



We get rid of parentheses

-10x-140+50=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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