-21=7(1+2x)

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



-21=7(1+2x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(7(2x+1))-21=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-28=0

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

-14x=28

x=28/-14

x=-2

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