0.3x+0.4=3.1

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Solution for 0.3x+0.4=3.1 equation: 


Simplifying
0.3x + 0.4 = 3.1

Reorder the terms:
0.4 + 0.3x = 3.1

Solving
0.4 + 0.3x = 3.1

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 + 0.3x = 3.1 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 0.3x = 3.1 + -0.4
0.3x = 3.1 + -0.4

Combine like terms: 3.1 + -0.4 = 2.7
0.3x = 2.7

Divide each side by '0.3'.
x = 9

Simplifying
x = 9

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