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25=7w-3
We move all terms to the left:
25-(7w-3)=0
We get rid of parentheses
-7w+3+25=0
We add all the numbers together, and all the variables
-7w+28=0
We move all terms containing w to the left, all other terms to the right
-7w=-28
w=-28/-7
w=+4
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