21=4z-3

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Solution for 21=4z-3 equation:


Simplifying
21 = 4z + -3

Reorder the terms:
21 = -3 + 4z

Solving
21 = -3 + 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.
21 + -4z = -3 + 4z + -4z

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

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

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

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

Divide each side by '-4'.
z = 6

Simplifying
z = 6

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