-4[Z-12]=42

Solution for -4[Z-12]=42 equation:

Simplifying
-4[Z + -12] = 42

Reorder the terms:
-4[-12 + Z] = 42
[-12 * -4 + Z * -4] = 42
[48 + -4Z] = 42

Solving
48 + -4Z = 42

Solving for variable 'Z'.

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

Add '-48' to each side of the equation.
48 + -48 + -4Z = 42 + -48

Combine like terms: 48 + -48 = 0
0 + -4Z = 42 + -48
-4Z = 42 + -48

Combine like terms: 42 + -48 = -6
-4Z = -6

Divide each side by '-4'.
Z = 1.5

Simplifying
Z = 1.5