25+6z-21=28

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Solution for 25+6z-21=28 equation: 


Simplifying
25 + 6z + -21 = 28

Reorder the terms:
25 + -21 + 6z = 28

Combine like terms: 25 + -21 = 4
4 + 6z = 28

Solving
4 + 6z = 28

Solving for variable 'z'.

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

Add '-4' to each side of the equation.
4 + -4 + 6z = 28 + -4

Combine like terms: 4 + -4 = 0
0 + 6z = 28 + -4
6z = 28 + -4

Combine like terms: 28 + -4 = 24
6z = 24

Divide each side by '6'.
z = 4

Simplifying
z = 4

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