9=72-13z-21

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Solution for 9=72-13z-21 equation: 


Simplifying
9 = 72 + -13z + -21

Reorder the terms:
9 = 72 + -21 + -13z

Combine like terms: 72 + -21 = 51
9 = 51 + -13z

Solving
9 = 51 + -13z

Solving for variable 'z'.

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

Add '13z' to each side of the equation.
9 + 13z = 51 + -13z + 13z

Combine like terms: -13z + 13z = 0
9 + 13z = 51 + 0
9 + 13z = 51

Add '-9' to each side of the equation.
9 + -9 + 13z = 51 + -9

Combine like terms: 9 + -9 = 0
0 + 13z = 51 + -9
13z = 51 + -9

Combine like terms: 51 + -9 = 42
13z = 42

Divide each side by '13'.
z = 3.230769231

Simplifying
z = 3.230769231

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