6.9-5.1=X

Solution for 6.9-5.1=X equation:

Simplifying
6.9 + -5.1 = X

Combine like terms: 6.9 + -5.1 = 1.8
1.8 = X

Solving
1.8 = 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.
1.8 + -1X = X + -1X

Combine like terms: X + -1X = 0
1.8 + -1X = 0

Add '-1.8' to each side of the equation.
1.8 + -1.8 + -1X = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -1X = 0 + -1.8
-1X = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
-1X = -1.8

Divide each side by '-1'.
X = 1.8

Simplifying
X = 1.8