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114=15w-21
We move all terms to the left:
114-(15w-21)=0
We get rid of parentheses
-15w+21+114=0
We add all the numbers together, and all the variables
-15w+135=0
We move all terms containing w to the left, all other terms to the right
-15w=-135
w=-135/-15
w=+9
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