(3+z)6+18z=90

Solution for (3+z)6+18z=90 equation:

Simplifying
(3 + z) * 6 + 18z = 90

Reorder the terms for easier multiplication:
6(3 + z) + 18z = 90
(3 * 6 + z * 6) + 18z = 90
(18 + 6z) + 18z = 90

Combine like terms: 6z + 18z = 24z
18 + 24z = 90

Solving
18 + 24z = 90

Solving for variable 'z'.

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

Add '-18' to each side of the equation.
18 + -18 + 24z = 90 + -18

Combine like terms: 18 + -18 = 0
0 + 24z = 90 + -18
24z = 90 + -18

Combine like terms: 90 + -18 = 72
24z = 72

Divide each side by '24'.
z = 3

Simplifying
z = 3