-3z+21=0

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Solution for -3z+21=0 equation: 


Simplifying
-3z + 21 = 0

Reorder the terms:
21 + -3z = 0

Solving
21 + -3z = 0

Solving for variable 'z'.

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

Add '-21' to each side of the equation.
21 + -21 + -3z = 0 + -21

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

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

Divide each side by '-3'.
z = 7

Simplifying
z = 7

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