z+20=21

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Solution for z+20=21 equation: 


Simplifying
z + 20 = 21

Reorder the terms:
20 + z = 21

Solving
20 + z = 21

Solving for variable 'z'.

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

Add '-20' to each side of the equation.
20 + -20 + z = 21 + -20

Combine like terms: 20 + -20 = 0
0 + z = 21 + -20
z = 21 + -20

Combine like terms: 21 + -20 = 1
z = 1

Simplifying
z = 1

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