(-1.8)-(-5.4)=X

Solution for (-1.8)-(-5.4)=X equation:

Simplifying
(-1.8) + -1(-5.4) = X
-1.8 + -1(-5.4) = X

Multiply -1 * -5.4
-1.8 + 5.4 = X

Combine like terms: -1.8 + 5.4 = 3.6
3.6 = X

Solving
3.6 = 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.
3.6 + -1X = X + -1X

Combine like terms: X + -1X = 0
3.6 + -1X = 0

Add '-3.6' to each side of the equation.
3.6 + -3.6 + -1X = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -1X = 0 + -3.6
-1X = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
-1X = -3.6

Divide each side by '-1'.
X = 3.6

Simplifying
X = 3.6