z+12=21

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Solution for z+12=21 equation: 


Simplifying
z + 12 = 21

Reorder the terms:
12 + z = 21

Solving
12 + z = 21

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 + z = 21 + -12

Combine like terms: 12 + -12 = 0
0 + z = 21 + -12
z = 21 + -12

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

Simplifying
z = 9

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