x+3.9=4.2

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Solution for x+3.9=4.2 equation: 


Simplifying
x + 3.9 = 4.2

Reorder the terms:
3.9 + x = 4.2

Solving
3.9 + x = 4.2

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 = 4.2 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + x = 4.2 + -3.9
x = 4.2 + -3.9

Combine like terms: 4.2 + -3.9 = 0.3
x = 0.3

Simplifying
x = 0.3

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