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72=k*12
We move all terms to the left:
72-(k*12)=0
We add all the numbers together, and all the variables
-(+k*12)+72=0
We get rid of parentheses
-k*12+72=0
Wy multiply elements
-12k+72=0
We move all terms containing k to the left, all other terms to the right
-12k=-72
k=-72/-12
k=+6
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