8+9z-2=8z+21-4z

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Solution for 8+9z-2=8z+21-4z equation:


Simplifying
8 + 9z + -2 = 8z + 21 + -4z

Reorder the terms:
8 + -2 + 9z = 8z + 21 + -4z

Combine like terms: 8 + -2 = 6
6 + 9z = 8z + 21 + -4z

Reorder the terms:
6 + 9z = 21 + 8z + -4z

Combine like terms: 8z + -4z = 4z
6 + 9z = 21 + 4z

Solving
6 + 9z = 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.
6 + 9z + -4z = 21 + 4z + -4z

Combine like terms: 9z + -4z = 5z
6 + 5z = 21 + 4z + -4z

Combine like terms: 4z + -4z = 0
6 + 5z = 21 + 0
6 + 5z = 21

Add '-6' to each side of the equation.
6 + -6 + 5z = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 5z = 21 + -6
5z = 21 + -6

Combine like terms: 21 + -6 = 15
5z = 15

Divide each side by '5'.
z = 3

Simplifying
z = 3

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