2w+9=w+21

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Solution for 2w+9=w+21 equation: 



2w+9=w+21

We move all terms to the left:

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

We get rid of parentheses

2w-w-21+9=0

We add all the numbers together, and all the variables

w-12=0

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

w=12

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