3(z-7)=9

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Solution for 3(z-7)=9 equation: 


Simplifying
3(z + -7) = 9

Reorder the terms:
3(-7 + z) = 9
(-7 * 3 + z * 3) = 9
(-21 + 3z) = 9

Solving
-21 + 3z = 9

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 + 3z = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 3z = 9 + 21
3z = 9 + 21

Combine like terms: 9 + 21 = 30
3z = 30

Divide each side by '3'.
z = 10

Simplifying
z = 10

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