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30=k*5
We move all terms to the left:
30-(k*5)=0
We add all the numbers together, and all the variables
-(+k*5)+30=0
We get rid of parentheses
-k*5+30=0
Wy multiply elements
-5k+30=0
We move all terms containing k to the left, all other terms to the right
-5k=-30
k=-30/-5
k=+6
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