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78=3w+15
We move all terms to the left:
78-(3w+15)=0
We get rid of parentheses
-3w-15+78=0
We add all the numbers together, and all the variables
-3w+63=0
We move all terms containing w to the left, all other terms to the right
-3w=-63
w=-63/-3
w=+21
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