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-115=-5(2-7k)
We move all terms to the left:
-115-(-5(2-7k))=0
We add all the numbers together, and all the variables
-(-5(-7k+2))-115=0
We calculate terms in parentheses: -(-5(-7k+2)), so:We get rid of parentheses
-5(-7k+2)
We multiply parentheses
35k-10
Back to the equation:
-(35k-10)
-35k+10-115=0
We add all the numbers together, and all the variables
-35k-105=0
We move all terms containing k to the left, all other terms to the right
-35k=105
k=105/-35
k=-3
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