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