X-.4=84

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Solution for X-.4=84 equation: 


Simplifying
X + -0.4 = 84

Reorder the terms:
-0.4 + X = 84

Solving
-0.4 + X = 84

Solving for variable 'X'.

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

Add '0.4' to each side of the equation.
-0.4 + 0.4 + X = 84 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + X = 84 + 0.4
X = 84 + 0.4

Combine like terms: 84 + 0.4 = 84.4
X = 84.4

Simplifying
X = 84.4

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