4z+12=z-9

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Solution for 4z+12=z-9 equation:


Simplifying
4z + 12 = z + -9

Reorder the terms:
12 + 4z = z + -9

Reorder the terms:
12 + 4z = -9 + z

Solving
12 + 4z = -9 + z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
12 + 4z + -1z = -9 + z + -1z

Combine like terms: 4z + -1z = 3z
12 + 3z = -9 + z + -1z

Combine like terms: z + -1z = 0
12 + 3z = -9 + 0
12 + 3z = -9

Add '-12' to each side of the equation.
12 + -12 + 3z = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 3z = -9 + -12
3z = -9 + -12

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

Divide each side by '3'.
z = -7

Simplifying
z = -7

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