-21+3x=-(1+7x)

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Solution for -21+3x=-(1+7x) equation: 



-21+3x=-(1+7x)

We move all terms to the left:

-21+3x-(-(1+7x))=0

We add all the numbers together, and all the variables

3x-(-(7x+1))-21=0



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

-(7x+1)

We get rid of parentheses

-7x-1

Back to the equation:

-(-7x-1)



We get rid of parentheses

3x+7x+1-21=0

We add all the numbers together, and all the variables

10x-20=0

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

10x=20

x=20/10

x=2

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