10z-9=4z+21

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Solution for 10z-9=4z+21 equation:


Simplifying
10z + -9 = 4z + 21

Reorder the terms:
-9 + 10z = 4z + 21

Reorder the terms:
-9 + 10z = 21 + 4z

Solving
-9 + 10z = 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 + 10z + -4z = 21 + 4z + -4z

Combine like terms: 10z + -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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