21=-3(-2+x)

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Solution for 21=-3(-2+x) equation: 



21=-3(-2+x)

We move all terms to the left:

21-(-3(-2+x))=0

We add all the numbers together, and all the variables

-(-3(x-2))+21=0



We calculate terms in parentheses: -(-3(x-2)), so:

-3(x-2)

We multiply parentheses

-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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