Z+18=21

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Solution for Z+18=21 equation: 


Simplifying
Z + 18 = 21

Reorder the terms:
18 + Z = 21

Solving
18 + Z = 21

Solving for variable 'Z'.

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

Add '-18' to each side of the equation.
18 + -18 + Z = 21 + -18

Combine like terms: 18 + -18 = 0
0 + Z = 21 + -18
Z = 21 + -18

Combine like terms: 21 + -18 = 3
Z = 3

Simplifying
Z = 3

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