X+2y=0.4

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Solution for X+2y=0.4 equation: 



X+2X=0.4

We move all terms to the left:

X+2X-(0.4)=0

We add all the numbers together, and all the variables

3X-0.4=0

We move all terms containing X to the left, all other terms to the right

3X=0.4

X=0.4/3

X=0.4/3

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