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0.4k+3/10+0.2k=9/10
We move all terms to the left:
0.4k+3/10+0.2k-(9/10)=0
We add all the numbers together, and all the variables
0.4k+0.2k+3/10-(+9/10)=0
We add all the numbers together, and all the variables
0.6k+3/10-(+9/10)=0
We get rid of parentheses
0.6k+3/10-9/10=0
We multiply all the terms by the denominator
(0.6k)*10+3-9=0
We add all the numbers together, and all the variables
(+0.6k)*10+3-9=0
We add all the numbers together, and all the variables
(+0.6k)*10-6=0
We multiply parentheses
0k-6=0
We add all the numbers together, and all the variables
k-6=0
We move all terms containing k to the left, all other terms to the right
k=6
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