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-5(1-7k)=135
We move all terms to the left:
-5(1-7k)-(135)=0
We add all the numbers together, and all the variables
-5(-7k+1)-135=0
We multiply parentheses
35k-5-135=0
We add all the numbers together, and all the variables
35k-140=0
We move all terms containing k to the left, all other terms to the right
35k=140
k=140/35
k=4
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