9+12=-9-3z

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Solution for 9+12=-9-3z equation:


Simplifying
9 + 12 = -9 + -3z

Combine like terms: 9 + 12 = 21
21 = -9 + -3z

Solving
21 = -9 + -3z

Solving for variable 'z'.

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

Add '3z' to each side of the equation.
21 + 3z = -9 + -3z + 3z

Combine like terms: -3z + 3z = 0
21 + 3z = -9 + 0
21 + 3z = -9

Add '-21' to each side of the equation.
21 + -21 + 3z = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 3z = -9 + -21
3z = -9 + -21

Combine like terms: -9 + -21 = -30
3z = -30

Divide each side by '3'.
z = -10

Simplifying
z = -10

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