-15+21=-3(x+1)

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Solution for -15+21=-3(x+1) equation: 



-15+21=-3(x+1)

We move all terms to the left:

-15+21-(-3(x+1))=0

We add all the numbers together, and all the variables

-(-3(x+1))+6=0



We calculate terms in parentheses: -(-3(x+1)), so:

-3(x+1)

We multiply parentheses

-3x-3

Back to the equation:

-(-3x-3)



We get rid of parentheses

3x+3+6=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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