w+12=21-w

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Solution for w+12=21-w equation: 



w+12=21-w

We move all terms to the left:

w+12-(21-w)=0

We add all the numbers together, and all the variables

w-(-1w+21)+12=0

We get rid of parentheses

w+1w-21+12=0

We add all the numbers together, and all the variables

2w-9=0

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

2w=9

w=9/2

w=4+1/2

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