90=(3z+6)+4z

Solution for 90=(3z+6)+4z equation:

Simplifying
90 = (3z + 6) + 4z

Reorder the terms:
90 = (6 + 3z) + 4z

Remove parenthesis around (6 + 3z)
90 = 6 + 3z + 4z

Combine like terms: 3z + 4z = 7z
90 = 6 + 7z

Solving
90 = 6 + 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.
90 + -7z = 6 + 7z + -7z

Combine like terms: 7z + -7z = 0
90 + -7z = 6 + 0
90 + -7z = 6

Add '-90' to each side of the equation.
90 + -90 + -7z = 6 + -90

Combine like terms: 90 + -90 = 0
0 + -7z = 6 + -90
-7z = 6 + -90

Combine like terms: 6 + -90 = -84
-7z = -84

Divide each side by '-7'.
z = 12

Simplifying
z = 12