X+3.9=10.2

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Solution for X+3.9=10.2 equation: 


Simplifying
X + 3.9 = 10.2

Reorder the terms:
3.9 + X = 10.2

Solving
3.9 + X = 10.2

Solving for variable 'X'.

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

Add '-3.9' to each side of the equation.
3.9 + -3.9 + X = 10.2 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + X = 10.2 + -3.9
X = 10.2 + -3.9

Combine like terms: 10.2 + -3.9 = 6.3
X = 6.3

Simplifying
X = 6.3

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