-z+8=21

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Solution for -z+8=21 equation: 


Simplifying
-1z + 8 = 21

Reorder the terms:
8 + -1z = 21

Solving
8 + -1z = 21

Solving for variable 'z'.

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

Add '-8' to each side of the equation.
8 + -8 + -1z = 21 + -8

Combine like terms: 8 + -8 = 0
0 + -1z = 21 + -8
-1z = 21 + -8

Combine like terms: 21 + -8 = 13
-1z = 13

Divide each side by '-1'.
z = -13

Simplifying
z = -13

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