42=8z+13z

Solution for 42=8z+13z equation:

Simplifying
42 = 8z + 13z

Combine like terms: 8z + 13z = 21z
42 = 21z

Solving
42 = 21z

Solving for variable 'z'.

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

Add '-21z' to each side of the equation.
42 + -21z = 21z + -21z

Combine like terms: 21z + -21z = 0
42 + -21z = 0

Add '-42' to each side of the equation.
42 + -42 + -21z = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -21z = 0 + -42
-21z = 0 + -42

Combine like terms: 0 + -42 = -42
-21z = -42

Divide each side by '-21'.
z = 2

Simplifying
z = 2