9z-12=6z-21

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Solution for 9z-12=6z-21 equation:


Simplifying
9z + -12 = 6z + -21

Reorder the terms:
-12 + 9z = 6z + -21

Reorder the terms:
-12 + 9z = -21 + 6z

Solving
-12 + 9z = -21 + 6z

Solving for variable 'z'.

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

Add '-6z' to each side of the equation.
-12 + 9z + -6z = -21 + 6z + -6z

Combine like terms: 9z + -6z = 3z
-12 + 3z = -21 + 6z + -6z

Combine like terms: 6z + -6z = 0
-12 + 3z = -21 + 0
-12 + 3z = -21

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

Combine like terms: -12 + 12 = 0
0 + 3z = -21 + 12
3z = -21 + 12

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

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

Simplifying
z = -3

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