-6+-9z=21

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Solution for -6+-9z=21 equation: 


Simplifying
-6 + -9z = 21

Solving
-6 + -9z = 21

Solving for variable 'z'.

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

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

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

Combine like terms: 21 + 6 = 27
-9z = 27

Divide each side by '-9'.
z = -3

Simplifying
z = -3

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