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-7(5-7k)=161
We move all terms to the left:
-7(5-7k)-(161)=0
We add all the numbers together, and all the variables
-7(-7k+5)-161=0
We multiply parentheses
49k-35-161=0
We add all the numbers together, and all the variables
49k-196=0
We move all terms containing k to the left, all other terms to the right
49k=196
k=196/49
k=4
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