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-3(w+5)+9=-21
We move all terms to the left:
-3(w+5)+9-(-21)=0
We add all the numbers together, and all the variables
-3(w+5)+30=0
We multiply parentheses
-3w-15+30=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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