3(z-9)+12=-21

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Solution for 3(z-9)+12=-21 equation: 


Simplifying
3(z + -9) + 12 = -21

Reorder the terms:
3(-9 + z) + 12 = -21
(-9 * 3 + z * 3) + 12 = -21
(-27 + 3z) + 12 = -21

Reorder the terms:
-27 + 12 + 3z = -21

Combine like terms: -27 + 12 = -15
-15 + 3z = -21

Solving
-15 + 3z = -21

Solving for variable 'z'.

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

Add '15' to each side of the equation.
-15 + 15 + 3z = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 3z = -21 + 15
3z = -21 + 15

Combine like terms: -21 + 15 = -6
3z = -6

Divide each side by '3'.
z = -2

Simplifying
z = -2

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