123=5x-2(-2x-21)

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Solution for 123=5x-2(-2x-21) equation: 



123=5x-2(-2x-21)

We move all terms to the left:

123-(5x-2(-2x-21))=0



We calculate terms in parentheses: -(5x-2(-2x-21)), so:

5x-2(-2x-21)

We multiply parentheses

5x+4x+42

We add all the numbers together, and all the variables

9x+42

Back to the equation:

-(9x+42)



We get rid of parentheses

-9x-42+123=0

We add all the numbers together, and all the variables

-9x+81=0

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

-9x=-81

x=-81/-9

x=+9

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