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3(k+10)=13k
We move all terms to the left:
3(k+10)-(13k)=0
We add all the numbers together, and all the variables
-13k+3(k+10)=0
We multiply parentheses
-13k+3k+30=0
We add all the numbers together, and all the variables
-10k+30=0
We move all terms containing k to the left, all other terms to the right
-10k=-30
k=-30/-10
k=+3
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