X+(7.8-1.2)=5.42

Solution for X+(7.8-1.2)=5.42 equation:

Simplifying
X + (7.8 + -1.2) = 5.42

Combine like terms: 7.8 + -1.2 = 6.6
X + (6.6) = 5.42
X + 6.6 = 5.42

Reorder the terms:
6.6 + X = 5.42

Solving
6.6 + X = 5.42

Solving for variable 'X'.

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

Add '-6.6' to each side of the equation.
6.6 + -6.6 + X = 5.42 + -6.6

Combine like terms: 6.6 + -6.6 = 0.0
0.0 + X = 5.42 + -6.6
X = 5.42 + -6.6

Combine like terms: 5.42 + -6.6 = -1.18
X = -1.18

Simplifying
X = -1.18