8.1-0.4x=6.9

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Solution for 8.1-0.4x=6.9 equation: 


Simplifying
8.1 + -0.4x = 6.9

Solving
8.1 + -0.4x = 6.9

Solving for variable 'x'.

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

Add '-8.1' to each side of the equation.
8.1 + -8.1 + -0.4x = 6.9 + -8.1

Combine like terms: 8.1 + -8.1 = 0.0
0.0 + -0.4x = 6.9 + -8.1
-0.4x = 6.9 + -8.1

Combine like terms: 6.9 + -8.1 = -1.2
-0.4x = -1.2

Divide each side by '-0.4'.
x = 3

Simplifying
x = 3

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