-21=7x-5(2x+9)

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Solution for -21=7x-5(2x+9) equation: 



-21=7x-5(2x+9)

We move all terms to the left:

-21-(7x-5(2x+9))=0



We calculate terms in parentheses: -(7x-5(2x+9)), so:

7x-5(2x+9)

We multiply parentheses

7x-10x-45

We add all the numbers together, and all the variables

-3x-45

Back to the equation:

-(-3x-45)



We get rid of parentheses

3x+45-21=0

We add all the numbers together, and all the variables

3x+24=0

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

3x=-24

x=-24/3

x=-8

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