-3z+6=-21

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Solution for -3z+6=-21 equation: 


Simplifying
-3z + 6 = -21

Reorder the terms:
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 = -27
-3z = -27

Divide each side by '-3'.
z = 9

Simplifying
z = 9

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