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25=-7w+3(w+3)
We move all terms to the left:
25-(-7w+3(w+3))=0
We calculate terms in parentheses: -(-7w+3(w+3)), so:We get rid of parentheses
-7w+3(w+3)
We multiply parentheses
-7w+3w+9
We add all the numbers together, and all the variables
-4w+9
Back to the equation:
-(-4w+9)
4w-9+25=0
We add all the numbers together, and all the variables
4w+16=0
We move all terms containing w to the left, all other terms to the right
4w=-16
w=-16/4
w=-4
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