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5(k-12)=9*10
We move all terms to the left:
5(k-12)-(9*10)=0
We add all the numbers together, and all the variables
5(k-12)-90=0
We multiply parentheses
5k-60-90=0
We add all the numbers together, and all the variables
5k-150=0
We move all terms containing k to the left, all other terms to the right
5k=150
k=150/5
k=30
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