2(x-3)-9=21-7x

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Solution for 2(x-3)-9=21-7x equation: 



2(x-3)-9=21-7x

We move all terms to the left:

2(x-3)-9-(21-7x)=0

We add all the numbers together, and all the variables

2(x-3)-(-7x+21)-9=0

We multiply parentheses

2x-(-7x+21)-6-9=0

We get rid of parentheses

2x+7x-21-6-9=0

We add all the numbers together, and all the variables

9x-36=0

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

9x=36

x=36/9

x=4

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