-18+21=-3(x+7)

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Solution for -18+21=-3(x+7) equation: 



-18+21=-3(x+7)

We move all terms to the left:

-18+21-(-3(x+7))=0

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-3(x+7)), so:

-3(x+7)

We multiply parentheses

-3x-21

Back to the equation:

-(-3x-21)



We get rid of parentheses

3x+21+3=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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