7z-13z-21=9

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Solution for 7z-13z-21=9 equation:


Simplifying
7z + -13z + -21 = 9

Reorder the terms:
-21 + 7z + -13z = 9

Combine like terms: 7z + -13z = -6z
-21 + -6z = 9

Solving
-21 + -6z = 9

Solving for variable 'z'.

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

Add '21' to each side of the equation.
-21 + 21 + -6z = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -6z = 9 + 21
-6z = 9 + 21

Combine like terms: 9 + 21 = 30
-6z = 30

Divide each side by '-6'.
z = -5

Simplifying
z = -5

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