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