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4(1+3k)+3=43
We move all terms to the left:
4(1+3k)+3-(43)=0
We add all the numbers together, and all the variables
4(3k+1)+3-43=0
We add all the numbers together, and all the variables
4(3k+1)-40=0
We multiply parentheses
12k+4-40=0
We add all the numbers together, and all the variables
12k-36=0
We move all terms containing k to the left, all other terms to the right
12k=36
k=36/12
k=3
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