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13=3(w-5)-7w
We move all terms to the left:
13-(3(w-5)-7w)=0
We calculate terms in parentheses: -(3(w-5)-7w), so:We get rid of parentheses
3(w-5)-7w
We add all the numbers together, and all the variables
-7w+3(w-5)
We multiply parentheses
-7w+3w-15
We add all the numbers together, and all the variables
-4w-15
Back to the equation:
-(-4w-15)
4w+15+13=0
We add all the numbers together, and all the variables
4w+28=0
We move all terms containing w to the left, all other terms to the right
4w=-28
w=-28/4
w=-7
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