10z-21=9+10

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


Simplifying
10z + -21 = 9 + 10

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

Combine like terms: 9 + 10 = 19
-21 + 10z = 19

Solving
-21 + 10z = 19

Solving for variable 'z'.

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

Add '21' to each side of the equation.
-21 + 21 + 10z = 19 + 21

Combine like terms: -21 + 21 = 0
0 + 10z = 19 + 21
10z = 19 + 21

Combine like terms: 19 + 21 = 40
10z = 40

Divide each side by '10'.
z = 4

Simplifying
z = 4

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