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7(2+6k)=-280
We move all terms to the left:
7(2+6k)-(-280)=0
We add all the numbers together, and all the variables
7(6k+2)-(-280)=0
We add all the numbers together, and all the variables
7(6k+2)+280=0
We multiply parentheses
42k+14+280=0
We add all the numbers together, and all the variables
42k+294=0
We move all terms containing k to the left, all other terms to the right
42k=-294
k=-294/42
k=-7
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