21=2(x+3)-3

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



21=2(x+3)-3

We move all terms to the left:

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



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

2(x+3)-3

We multiply parentheses

2x+6-3

We add all the numbers together, and all the variables

2x+3

Back to the equation:

-(2x+3)



We get rid of parentheses

-2x-3+21=0

We add all the numbers together, and all the variables

-2x+18=0

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

-2x=-18

x=-18/-2

x=+9

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