3.9+x=8

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Solution for 3.9+x=8 equation: 


Simplifying
3.9 + x = 8

Solving
3.9 + x = 8

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 = 8 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + x = 8 + -3.9
x = 8 + -3.9

Combine like terms: 8 + -3.9 = 4.1
x = 4.1

Simplifying
x = 4.1

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