7z+21=42

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Solution for 7z+21=42 equation: 


Simplifying
7z + 21 = 42

Reorder the terms:
21 + 7z = 42

Solving
21 + 7z = 42

Solving for variable 'z'.

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

Add '-21' to each side of the equation.
21 + -21 + 7z = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 7z = 42 + -21
7z = 42 + -21

Combine like terms: 42 + -21 = 21
7z = 21

Divide each side by '7'.
z = 3

Simplifying
z = 3

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