-7x-21=-4(x+3)

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Solution for -7x-21=-4(x+3) equation: 



-7x-21=-4(x+3)

We move all terms to the left:

-7x-21-(-4(x+3))=0



We calculate terms in parentheses: -(-4(x+3)), so:

-4(x+3)

We multiply parentheses

-4x-12

Back to the equation:

-(-4x-12)



We get rid of parentheses

-7x+4x+12-21=0

We add all the numbers together, and all the variables

-3x-9=0

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

-3x=9

x=9/-3

x=-3

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