2x+0.4=9

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Solution for 2x+0.4=9 equation: 


Simplifying
2x + 0.4 = 9

Reorder the terms:
0.4 + 2x = 9

Solving
0.4 + 2x = 9

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 + 2x = 9 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 2x = 9 + -0.4
2x = 9 + -0.4

Combine like terms: 9 + -0.4 = 8.6
2x = 8.6

Divide each side by '2'.
x = 4.3

Simplifying
x = 4.3

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