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12=4+2w
We move all terms to the left:
12-(4+2w)=0
We add all the numbers together, and all the variables
-(2w+4)+12=0
We get rid of parentheses
-2w-4+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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