X+0.4x=90

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Solution for X+0.4x=90 equation: 



X+0.4X=90

We move all terms to the left:

X+0.4X-(90)=0

We add all the numbers together, and all the variables

1.4X-90=0

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

1.4X=90

X=90/1.4

X=64+0.4/1.4

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