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4(k+3)+2(k+1)=20
We move all terms to the left:
4(k+3)+2(k+1)-(20)=0
We multiply parentheses
4k+2k+12+2-20=0
We add all the numbers together, and all the variables
6k-6=0
We move all terms containing k to the left, all other terms to the right
6k=6
k=6/6
k=1
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