15-3z=21

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Solution for 15-3z=21 equation: 


Simplifying
15 + -3z = 21

Solving
15 + -3z = 21

Solving for variable 'z'.

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

Add '-15' to each side of the equation.
15 + -15 + -3z = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -3z = 21 + -15
-3z = 21 + -15

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

Divide each side by '-3'.
z = -2

Simplifying
z = -2

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