5z+4=9z-21

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Solution for 5z+4=9z-21 equation:


Simplifying
5z + 4 = 9z + -21

Reorder the terms:
4 + 5z = 9z + -21

Reorder the terms:
4 + 5z = -21 + 9z

Solving
4 + 5z = -21 + 9z

Solving for variable 'z'.

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

Add '-9z' to each side of the equation.
4 + 5z + -9z = -21 + 9z + -9z

Combine like terms: 5z + -9z = -4z
4 + -4z = -21 + 9z + -9z

Combine like terms: 9z + -9z = 0
4 + -4z = -21 + 0
4 + -4z = -21

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

Combine like terms: 4 + -4 = 0
0 + -4z = -21 + -4
-4z = -21 + -4

Combine like terms: -21 + -4 = -25
-4z = -25

Divide each side by '-4'.
z = 6.25

Simplifying
z = 6.25

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