0.69=0.4+X

Solution for 0.69=0.4+X equation:

Simplifying
0.69 = 0.4 + X

Solving
0.69 = 0.4 + X

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
0.69 + -1X = 0.4 + X + -1X

Combine like terms: X + -1X = 0
0.69 + -1X = 0.4 + 0
0.69 + -1X = 0.4

Add '-0.69' to each side of the equation.
0.69 + -0.69 + -1X = 0.4 + -0.69

Combine like terms: 0.69 + -0.69 = 0.00
0.00 + -1X = 0.4 + -0.69
-1X = 0.4 + -0.69

Combine like terms: 0.4 + -0.69 = -0.29
-1X = -0.29

Divide each side by '-1'.
X = 0.29

Simplifying
X = 0.29