z+13=21

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Solution for z+13=21 equation: 


Simplifying
z + 13 = 21

Reorder the terms:
13 + z = 21

Solving
13 + z = 21

Solving for variable 'z'.

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

Add '-13' to each side of the equation.
13 + -13 + z = 21 + -13

Combine like terms: 13 + -13 = 0
0 + z = 21 + -13
z = 21 + -13

Combine like terms: 21 + -13 = 8
z = 8

Simplifying
z = 8

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