42=z-8z

Solution for 42=z-8z equation:

Simplifying
42 = z + -8z

Combine like terms: z + -8z = -7z
42 = -7z

Solving
42 = -7z

Solving for variable 'z'.

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

Add '7z' to each side of the equation.
42 + 7z = -7z + 7z

Combine like terms: -7z + 7z = 0
42 + 7z = 0

Add '-42' to each side of the equation.
42 + -42 + 7z = 0 + -42

Combine like terms: 42 + -42 = 0
0 + 7z = 0 + -42
7z = 0 + -42

Combine like terms: 0 + -42 = -42
7z = -42

Divide each side by '7'.
z = -6

Simplifying
z = -6