0=4z-21

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Solution for 0=4z-21 equation: 


Simplifying
0 = 4z + -21

Reorder the terms:
0 = -21 + 4z

Solving
0 = -21 + 4z

Solving for variable 'z'.

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

Add '-4z' to each side of the equation.
0 + -4z = -21 + 4z + -4z
Remove the zero:
-4z = -21 + 4z + -4z

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

Divide each side by '-4'.
z = 5.25

Simplifying
z = 5.25

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