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k+2(5k-3)=7
We move all terms to the left:
k+2(5k-3)-(7)=0
We multiply parentheses
k+10k-6-7=0
We add all the numbers together, and all the variables
11k-13=0
We move all terms containing k to the left, all other terms to the right
11k=13
k=13/11
k=1+2/11
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