-3(z-1)=21

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Solution for -3(z-1)=21 equation: 


Simplifying
-3(z + -1) = 21

Reorder the terms:
-3(-1 + z) = 21
(-1 * -3 + z * -3) = 21
(3 + -3z) = 21

Solving
3 + -3z = 21

Solving for variable 'z'.

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

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

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

Combine like terms: 21 + -3 = 18
-3z = 18

Divide each side by '-3'.
z = -6

Simplifying
z = -6

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