4z-5=-21

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Solution for 4z-5=-21 equation: 


Simplifying
4z + -5 = -21

Reorder the terms:
-5 + 4z = -21

Solving
-5 + 4z = -21

Solving for variable 'z'.

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

Add '5' to each side of the equation.
-5 + 5 + 4z = -21 + 5

Combine like terms: -5 + 5 = 0
0 + 4z = -21 + 5
4z = -21 + 5

Combine like terms: -21 + 5 = -16
4z = -16

Divide each side by '4'.
z = -4

Simplifying
z = -4

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