6z-21=z+9

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


Simplifying
6z + -21 = z + 9

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

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

Solving
-21 + 6z = 9 + z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
-21 + 6z + -1z = 9 + z + -1z

Combine like terms: 6z + -1z = 5z
-21 + 5z = 9 + z + -1z

Combine like terms: z + -1z = 0
-21 + 5z = 9 + 0
-21 + 5z = 9

Add '21' to each side of the equation.
-21 + 21 + 5z = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 5z = 9 + 21
5z = 9 + 21

Combine like terms: 9 + 21 = 30
5z = 30

Divide each side by '5'.
z = 6

Simplifying
z = 6

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