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9=4+k/3
We move all terms to the left:
9-(4+k/3)=0
We add all the numbers together, and all the variables
-(k/3+4)+9=0
We get rid of parentheses
-k/3-4+9=0
We multiply all the terms by the denominator
-k-4*3+9*3=0
We add all the numbers together, and all the variables
-1k+15=0
We move all terms containing k to the left, all other terms to the right
-k=-15
k=-15/-1
k=+15
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