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3k+8(k-3)=90
We move all terms to the left:
3k+8(k-3)-(90)=0
We multiply parentheses
3k+8k-24-90=0
We add all the numbers together, and all the variables
11k-114=0
We move all terms containing k to the left, all other terms to the right
11k=114
k=114/11
k=10+4/11
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