6z+9-3z=21-3z

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Solution for 6z+9-3z=21-3z equation:


Simplifying
6z + 9 + -3z = 21 + -3z

Reorder the terms:
9 + 6z + -3z = 21 + -3z

Combine like terms: 6z + -3z = 3z
9 + 3z = 21 + -3z

Solving
9 + 3z = 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.
9 + 3z + 3z = 21 + -3z + 3z

Combine like terms: 3z + 3z = 6z
9 + 6z = 21 + -3z + 3z

Combine like terms: -3z + 3z = 0
9 + 6z = 21 + 0
9 + 6z = 21

Add '-9' to each side of the equation.
9 + -9 + 6z = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 6z = 21 + -9
6z = 21 + -9

Combine like terms: 21 + -9 = 12
6z = 12

Divide each side by '6'.
z = 2

Simplifying
z = 2

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