10z-(3-2z)=21

Solution for 10z-(3-2z)=21 equation:

Simplifying
10z + -1(3 + -2z) = 21
10z + (3 * -1 + -2z * -1) = 21
10z + (-3 + 2z) = 21

Reorder the terms:
-3 + 10z + 2z = 21

Combine like terms: 10z + 2z = 12z
-3 + 12z = 21

Solving
-3 + 12z = 21

Solving for variable 'z'.

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

Add '3' to each side of the equation.
-3 + 3 + 12z = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 12z = 21 + 3
12z = 21 + 3

Combine like terms: 21 + 3 = 24
12z = 24

Divide each side by '12'.
z = 2

Simplifying
z = 2