X=21-0.6y

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Solution for X=21-0.6y equation:



X=21-0.6X
We move all terms to the left:
X-(21-0.6X)=0
We add all the numbers together, and all the variables
X-(-0.6X+21)=0
We get rid of parentheses
X+0.6X-21=0
We add all the numbers together, and all the variables
1.6X-21=0
We move all terms containing X to the left, all other terms to the right
1.6X=21
X=21/1.6
X=13+0.2/1.6

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