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31=-7w+4(w+4)
We move all terms to the left:
31-(-7w+4(w+4))=0
We calculate terms in parentheses: -(-7w+4(w+4)), so:We get rid of parentheses
-7w+4(w+4)
We multiply parentheses
-7w+4w+16
We add all the numbers together, and all the variables
-3w+16
Back to the equation:
-(-3w+16)
3w-16+31=0
We add all the numbers together, and all the variables
3w+15=0
We move all terms containing w to the left, all other terms to the right
3w=-15
w=-15/3
w=-5
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