21=3(4z-5)

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Solution for 21=3(4z-5) equation:


Simplifying
21 = 3(4z + -5)

Reorder the terms:
21 = 3(-5 + 4z)
21 = (-5 * 3 + 4z * 3)
21 = (-15 + 12z)

Solving
21 = -15 + 12z

Solving for variable 'z'.

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

Add '-12z' to each side of the equation.
21 + -12z = -15 + 12z + -12z

Combine like terms: 12z + -12z = 0
21 + -12z = -15 + 0
21 + -12z = -15

Add '-21' to each side of the equation.
21 + -21 + -12z = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -12z = -15 + -21
-12z = -15 + -21

Combine like terms: -15 + -21 = -36
-12z = -36

Divide each side by '-12'.
z = 3

Simplifying
z = 3

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