7z-13z-12=9

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Solution for 7z-13z-12=9 equation: 


Simplifying
7z + -13z + -12 = 9

Reorder the terms:
-12 + 7z + -13z = 9

Combine like terms: 7z + -13z = -6z
-12 + -6z = 9

Solving
-12 + -6z = 9

Solving for variable 'z'.

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

Add '12' to each side of the equation.
-12 + 12 + -6z = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -6z = 9 + 12
-6z = 9 + 12

Combine like terms: 9 + 12 = 21
-6z = 21

Divide each side by '-6'.
z = -3.5

Simplifying
z = -3.5

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