-21=-7(2x+1)

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Solution for -21=-7(2x+1) equation: 



-21=-7(2x+1)

We move all terms to the left:

-21-(-7(2x+1))=0



We calculate terms in parentheses: -(-7(2x+1)), so:

-7(2x+1)

We multiply parentheses

-14x-7

Back to the equation:

-(-14x-7)



We get rid of parentheses

14x+7-21=0

We add all the numbers together, and all the variables

14x-14=0

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

14x=14

x=14/14

x=1

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