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6=k*15
We move all terms to the left:
6-(k*15)=0
We add all the numbers together, and all the variables
-(+k*15)+6=0
We get rid of parentheses
-k*15+6=0
Wy multiply elements
-15k+6=0
We move all terms containing k to the left, all other terms to the right
-15k=-6
k=-6/-15
k=2/5
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