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-336=7(1-7k)
We move all terms to the left:
-336-(7(1-7k))=0
We add all the numbers together, and all the variables
-(7(-7k+1))-336=0
We calculate terms in parentheses: -(7(-7k+1)), so:We get rid of parentheses
7(-7k+1)
We multiply parentheses
-49k+7
Back to the equation:
-(-49k+7)
49k-7-336=0
We add all the numbers together, and all the variables
49k-343=0
We move all terms containing k to the left, all other terms to the right
49k=343
k=343/49
k=7
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