9-2z=4z-21

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Solution for 9-2z=4z-21 equation:


Simplifying
9 + -2z = 4z + -21

Reorder the terms:
9 + -2z = -21 + 4z

Solving
9 + -2z = -21 + 4z

Solving for variable 'z'.

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

Add '-4z' to each side of the equation.
9 + -2z + -4z = -21 + 4z + -4z

Combine like terms: -2z + -4z = -6z
9 + -6z = -21 + 4z + -4z

Combine like terms: 4z + -4z = 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 = -30
-6z = -30

Divide each side by '-6'.
z = 5

Simplifying
z = 5

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