(12-z)*7=21

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Solution for (12-z)*7=21 equation:


Simplifying
(12 + -1z) * 7 = 21

Reorder the terms for easier multiplication:
7(12 + -1z) = 21
(12 * 7 + -1z * 7) = 21
(84 + -7z) = 21

Solving
84 + -7z = 21

Solving for variable 'z'.

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

Add '-84' to each side of the equation.
84 + -84 + -7z = 21 + -84

Combine like terms: 84 + -84 = 0
0 + -7z = 21 + -84
-7z = 21 + -84

Combine like terms: 21 + -84 = -63
-7z = -63

Divide each side by '-7'.
z = 9

Simplifying
z = 9

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