81=(z+8)*9

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Solution for 81=(z+8)*9 equation:


Simplifying
81 = (z + 8) * 9

Reorder the terms:
81 = (8 + z) * 9

Reorder the terms for easier multiplication:
81 = 9(8 + z)
81 = (8 * 9 + z * 9)
81 = (72 + 9z)

Solving
81 = 72 + 9z

Solving for variable 'z'.

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

Add '-9z' to each side of the equation.
81 + -9z = 72 + 9z + -9z

Combine like terms: 9z + -9z = 0
81 + -9z = 72 + 0
81 + -9z = 72

Add '-81' to each side of the equation.
81 + -81 + -9z = 72 + -81

Combine like terms: 81 + -81 = 0
0 + -9z = 72 + -81
-9z = 72 + -81

Combine like terms: 72 + -81 = -9
-9z = -9

Divide each side by '-9'.
z = 1

Simplifying
z = 1

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