6-21=3z

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Solution for 6-21=3z equation:


Simplifying
6 + -21 = 3z

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

Solving
-15 = 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 = 3z + -3z

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

Add '15' to each side of the equation.
-15 + 15 + -3z = 0 + 15

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

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

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

Simplifying
z = -5

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