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9=3(w-4)-21
We move all terms to the left:
9-(3(w-4)-21)=0
We calculate terms in parentheses: -(3(w-4)-21), so:We get rid of parentheses
3(w-4)-21
We multiply parentheses
3w-12-21
We add all the numbers together, and all the variables
3w-33
Back to the equation:
-(3w-33)
-3w+33+9=0
We add all the numbers together, and all the variables
-3w+42=0
We move all terms containing w to the left, all other terms to the right
-3w=-42
w=-42/-3
w=+14
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