6-3z=21

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Solution for 6-3z=21 equation:


Simplifying
6 + -3z = 21

Solving
6 + -3z = 21

Solving for variable 'z'.

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

Add '-6' to each side of the equation.
6 + -6 + -3z = 21 + -6

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

Combine like terms: 21 + -6 = 15
-3z = 15

Divide each side by '-3'.
z = -5

Simplifying
z = -5

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