3(z+7)=21

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Solution for 3(z+7)=21 equation: 


Simplifying
3(z + 7) = 21

Reorder the terms:
3(7 + z) = 21
(7 * 3 + z * 3) = 21
(21 + 3z) = 21

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

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

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

Solving
3z = 0

Solving for variable 'z'.

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

Divide each side by '3'.
z = 0

Simplifying
z = 0

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