w+21=2w+4

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Solution for w+21=2w+4 equation: 



w+21=2w+4

We move all terms to the left:

w+21-(2w+4)=0

We get rid of parentheses

w-2w-4+21=0

We add all the numbers together, and all the variables

-1w+17=0

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

-w=-17

w=-17/-1

w=+17

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