10z-21=9z+10

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


Simplifying
10z + -21 = 9z + 10

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

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

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

Combine like terms: 10z + -9z = 1z
-21 + 1z = 10 + 9z + -9z

Combine like terms: 9z + -9z = 0
-21 + 1z = 10 + 0
-21 + 1z = 10

Add '21' to each side of the equation.
-21 + 21 + 1z = 10 + 21

Combine like terms: -21 + 21 = 0
0 + 1z = 10 + 21
1z = 10 + 21

Combine like terms: 10 + 21 = 31
1z = 31

Divide each side by '1'.
z = 31

Simplifying
z = 31

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