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2(5+4w)+2w=90
We move all terms to the left:
2(5+4w)+2w-(90)=0
We add all the numbers together, and all the variables
2(4w+5)+2w-90=0
We add all the numbers together, and all the variables
2w+2(4w+5)-90=0
We multiply parentheses
2w+8w+10-90=0
We add all the numbers together, and all the variables
10w-80=0
We move all terms containing w to the left, all other terms to the right
10w=80
w=80/10
w=8
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