3(2z-7)=21

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Solution for 3(2z-7)=21 equation: 


Simplifying
3(2z + -7) = 21

Reorder the terms:
3(-7 + 2z) = 21
(-7 * 3 + 2z * 3) = 21
(-21 + 6z) = 21

Solving
-21 + 6z = 21

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 + 6z = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 6z = 21 + 21
6z = 21 + 21

Combine like terms: 21 + 21 = 42
6z = 42

Divide each side by '6'.
z = 7

Simplifying
z = 7

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