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3.6-0.3(k+1)=2.1
We move all terms to the left:
3.6-0.3(k+1)-(2.1)=0
We add all the numbers together, and all the variables
-0.3(k+1)+1.5=0
We multiply parentheses
-0.3k-0.3+1.5=0
We add all the numbers together, and all the variables
-0.3k+1.2=0
We move all terms containing k to the left, all other terms to the right
-0.3k=-1.2
k=-1.2/-0.3
k=+4
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