12=-2(-9-3z)

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Solution for 12=-2(-9-3z) equation:


Simplifying
12 = -2(-9 + -3z)
12 = (-9 * -2 + -3z * -2)
12 = (18 + 6z)

Solving
12 = 18 + 6z

Solving for variable 'z'.

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

Add '-6z' to each side of the equation.
12 + -6z = 18 + 6z + -6z

Combine like terms: 6z + -6z = 0
12 + -6z = 18 + 0
12 + -6z = 18

Add '-12' to each side of the equation.
12 + -12 + -6z = 18 + -12

Combine like terms: 12 + -12 = 0
0 + -6z = 18 + -12
-6z = 18 + -12

Combine like terms: 18 + -12 = 6
-6z = 6

Divide each side by '-6'.
z = -1

Simplifying
z = -1

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