(z+21)=12

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Solution for (z+21)=12 equation: 


Simplifying
(z + 21) = 12

Reorder the terms:
(21 + z) = 12

Remove parenthesis around (21 + z)
21 + z = 12

Solving
21 + z = 12

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 + z = 12 + -21

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

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

Simplifying
z = -9

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