3-12=-2z

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Solution for 3-12=-2z equation:


Simplifying
3 + -12 = -2z

Combine like terms: 3 + -12 = -9
-9 = -2z

Solving
-9 = -2z

Solving for variable 'z'.

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

Add '2z' to each side of the equation.
-9 + 2z = -2z + 2z

Combine like terms: -2z + 2z = 0
-9 + 2z = 0

Add '9' to each side of the equation.
-9 + 9 + 2z = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 2z = 0 + 9
2z = 0 + 9

Combine like terms: 0 + 9 = 9
2z = 9

Divide each side by '2'.
z = 4.5

Simplifying
z = 4.5

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