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9w-12=-3(w-4)
We move all terms to the left:
9w-12-(-3(w-4))=0
We calculate terms in parentheses: -(-3(w-4)), so:We get rid of parentheses
-3(w-4)
We multiply parentheses
-3w+12
Back to the equation:
-(-3w+12)
9w+3w-12-12=0
We add all the numbers together, and all the variables
12w-24=0
We move all terms containing w to the left, all other terms to the right
12w=24
w=24/12
w=2
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