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2+15k+13=20+10k
We move all terms to the left:
2+15k+13-(20+10k)=0
We add all the numbers together, and all the variables
15k-(10k+20)+2+13=0
We add all the numbers together, and all the variables
15k-(10k+20)+15=0
We get rid of parentheses
15k-10k-20+15=0
We add all the numbers together, and all the variables
5k-5=0
We move all terms containing k to the left, all other terms to the right
5k=5
k=5/5
k=1
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