4z-4+1=21

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Solution for 4z-4+1=21 equation: 


Simplifying
4z + -4 + 1 = 21

Reorder the terms:
-4 + 1 + 4z = 21

Combine like terms: -4 + 1 = -3
-3 + 4z = 21

Solving
-3 + 4z = 21

Solving for variable 'z'.

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

Add '3' to each side of the equation.
-3 + 3 + 4z = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 4z = 21 + 3
4z = 21 + 3

Combine like terms: 21 + 3 = 24
4z = 24

Divide each side by '4'.
z = 6

Simplifying
z = 6

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