9+2x=2(-x+9)-21

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Solution for 9+2x=2(-x+9)-21 equation: 



9+2x=2(-x+9)-21

We move all terms to the left:

9+2x-(2(-x+9)-21)=0

We add all the numbers together, and all the variables

2x-(2(-1x+9)-21)+9=0



We calculate terms in parentheses: -(2(-1x+9)-21), so:

2(-1x+9)-21

We multiply parentheses

-2x+18-21

We add all the numbers together, and all the variables

-2x-3

Back to the equation:

-(-2x-3)



We get rid of parentheses

2x+2x+3+9=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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