21=7z

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Solution for 21=7z equation:


Simplifying
21 = 7z

Solving
21 = 7z

Solving for variable 'z'.

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

Add '-7z' to each side of the equation.
21 + -7z = 7z + -7z

Combine like terms: 7z + -7z = 0
21 + -7z = 0

Add '-21' to each side of the equation.
21 + -21 + -7z = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -7z = 0 + -21
-7z = 0 + -21

Combine like terms: 0 + -21 = -21
-7z = -21

Divide each side by '-7'.
z = 3

Simplifying
z = 3

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