.2X=.9-.1X

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Solution for .2X=.9-.1X equation: 


Simplifying
0.2X = 0.9 + -0.1X

Solving
0.2X = 0.9 + -0.1X

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '0.1X' to each side of the equation.
0.2X + 0.1X = 0.9 + -0.1X + 0.1X

Combine like terms: 0.2X + 0.1X = 0.3X
0.3X = 0.9 + -0.1X + 0.1X

Combine like terms: -0.1X + 0.1X = 0.0
0.3X = 0.9 + 0.0
0.3X = 0.9

Divide each side by '0.3'.
X = 3

Simplifying
X = 3

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