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25+w=4+8w
We move all terms to the left:
25+w-(4+8w)=0
We add all the numbers together, and all the variables
w-(8w+4)+25=0
We get rid of parentheses
w-8w-4+25=0
We add all the numbers together, and all the variables
-7w+21=0
We move all terms containing w to the left, all other terms to the right
-7w=-21
w=-21/-7
w=+3
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