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7(3w+7)=25
We move all terms to the left:
7(3w+7)-(25)=0
We multiply parentheses
21w+49-25=0
We add all the numbers together, and all the variables
21w+24=0
We move all terms containing w to the left, all other terms to the right
21w=-24
w=-24/21
w=-1+1/7
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