5z-9=8z-21

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Solution for 5z-9=8z-21 equation:


Simplifying
5z + -9 = 8z + -21

Reorder the terms:
-9 + 5z = 8z + -21

Reorder the terms:
-9 + 5z = -21 + 8z

Solving
-9 + 5z = -21 + 8z

Solving for variable 'z'.

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

Add '-8z' to each side of the equation.
-9 + 5z + -8z = -21 + 8z + -8z

Combine like terms: 5z + -8z = -3z
-9 + -3z = -21 + 8z + -8z

Combine like terms: 8z + -8z = 0
-9 + -3z = -21 + 0
-9 + -3z = -21

Add '9' to each side of the equation.
-9 + 9 + -3z = -21 + 9

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

Combine like terms: -21 + 9 = -12
-3z = -12

Divide each side by '-3'.
z = 4

Simplifying
z = 4

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