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6=4+k/9
We move all terms to the left:
6-(4+k/9)=0
We add all the numbers together, and all the variables
-(k/9+4)+6=0
We get rid of parentheses
-k/9-4+6=0
We multiply all the terms by the denominator
-k-4*9+6*9=0
We add all the numbers together, and all the variables
-1k+18=0
We move all terms containing k to the left, all other terms to the right
-k=-18
k=-18/-1
k=+18
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