15=21-3z

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Solution for 15=21-3z equation:


Simplifying
15 = 21 + -3z

Solving
15 = 21 + -3z

Solving for variable 'z'.

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

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

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

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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