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84=7(w+10)
We move all terms to the left:
84-(7(w+10))=0
We calculate terms in parentheses: -(7(w+10)), so:We get rid of parentheses
7(w+10)
We multiply parentheses
7w+70
Back to the equation:
-(7w+70)
-7w-70+84=0
We add all the numbers together, and all the variables
-7w+14=0
We move all terms containing w to the left, all other terms to the right
-7w=-14
w=-14/-7
w=+2
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