X+.4x=280

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Solution for X+.4x=280 equation: 



X+.4X=280

We move all terms to the left:

X+.4X-(280)=0

We add all the numbers together, and all the variables

1.4X-280=0

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

1.4X=280

X=280/1.4

X=200

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