z-18-21=

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Solution for z-18-21= equation: 


Simplifying
z + -18 + -21 = 0

Reorder the terms:
-18 + -21 + z = 0

Combine like terms: -18 + -21 = -39
-39 + z = 0

Solving
-39 + z = 0

Solving for variable 'z'.

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

Add '39' to each side of the equation.
-39 + 39 + z = 0 + 39

Combine like terms: -39 + 39 = 0
0 + z = 0 + 39
z = 0 + 39

Combine like terms: 0 + 39 = 39
z = 39

Simplifying
z = 39

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