21-z=-9

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Solution for 21-z=-9 equation: 


Simplifying
21 + -1z = -9

Solving
21 + -1z = -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 + -1z = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -1z = -9 + -21
-1z = -9 + -21

Combine like terms: -9 + -21 = -30
-1z = -30

Divide each side by '-1'.
z = 30

Simplifying
z = 30

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