-15+21=-3(x+4)

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Solution for -15+21=-3(x+4) equation: 



-15+21=-3(x+4)

We move all terms to the left:

-15+21-(-3(x+4))=0

We add all the numbers together, and all the variables

-(-3(x+4))+6=0



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

-3(x+4)

We multiply parentheses

-3x-12

Back to the equation:

-(-3x-12)



We get rid of parentheses

3x+12+6=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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