7(k-1)=105

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Solution for 7(k-1)=105 equation: 



7(k-1)=105

We move all terms to the left:

7(k-1)-(105)=0

We multiply parentheses

7k-7-105=0

We add all the numbers together, and all the variables

7k-112=0

We move all terms containing k to the left, all other terms to the right

7k=112

k=112/7

k=16

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