12=20-2w

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Solution for 12=20-2w equation: 



12=20-2w

We move all terms to the left:

12-(20-2w)=0

We add all the numbers together, and all the variables

-(-2w+20)+12=0

We get rid of parentheses

2w-20+12=0

We add all the numbers together, and all the variables

2w-8=0

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

2w=8

w=8/2

w=4

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