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5(1+1k)=50
We move all terms to the left:
5(1+1k)-(50)=0
We add all the numbers together, and all the variables
5(k+1)-50=0
We multiply parentheses
5k+5-50=0
We add all the numbers together, and all the variables
5k-45=0
We move all terms containing k to the left, all other terms to the right
5k=45
k=45/5
k=9
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