12z-21=3z+9

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Solution for 12z-21=3z+9 equation:


Simplifying
12z + -21 = 3z + 9

Reorder the terms:
-21 + 12z = 3z + 9

Reorder the terms:
-21 + 12z = 9 + 3z

Solving
-21 + 12z = 9 + 3z

Solving for variable 'z'.

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

Add '-3z' to each side of the equation.
-21 + 12z + -3z = 9 + 3z + -3z

Combine like terms: 12z + -3z = 9z
-21 + 9z = 9 + 3z + -3z

Combine like terms: 3z + -3z = 0
-21 + 9z = 9 + 0
-21 + 9z = 9

Add '21' to each side of the equation.
-21 + 21 + 9z = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 9z = 9 + 21
9z = 9 + 21

Combine like terms: 9 + 21 = 30
9z = 30

Divide each side by '9'.
z = 3.333333333

Simplifying
z = 3.333333333

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