21=12z-15

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Solution for 21=12z-15 equation:


Simplifying
21 = 12z + -15

Reorder the terms:
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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