-21=-3(7+x)+15

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Solution for -21=-3(7+x)+15 equation: 



-21=-3(7+x)+15

We move all terms to the left:

-21-(-3(7+x)+15)=0

We add all the numbers together, and all the variables

-(-3(x+7)+15)-21=0



We calculate terms in parentheses: -(-3(x+7)+15), so:

-3(x+7)+15

We multiply parentheses

-3x-21+15

We add all the numbers together, and all the variables

-3x-6

Back to the equation:

-(-3x-6)



We get rid of parentheses

3x+6-21=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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