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-35=-7(-9+k)
We move all terms to the left:
-35-(-7(-9+k))=0
We add all the numbers together, and all the variables
-(-7(k-9))-35=0
We calculate terms in parentheses: -(-7(k-9)), so:We get rid of parentheses
-7(k-9)
We multiply parentheses
-7k+63
Back to the equation:
-(-7k+63)
7k-63-35=0
We add all the numbers together, and all the variables
7k-98=0
We move all terms containing k to the left, all other terms to the right
7k=98
k=98/7
k=14
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