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w+(2w+3)=78
We move all terms to the left:
w+(2w+3)-(78)=0
We get rid of parentheses
w+2w+3-78=0
We add all the numbers together, and all the variables
3w-75=0
We move all terms containing w to the left, all other terms to the right
3w=75
w=75/3
w=25
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