18=6-(z+9)

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Solution for 18=6-(z+9) equation:


Simplifying
18 = 6 + -1(z + 9)

Reorder the terms:
18 = 6 + -1(9 + z)
18 = 6 + (9 * -1 + z * -1)
18 = 6 + (-9 + -1z)

Combine like terms: 6 + -9 = -3
18 = -3 + -1z

Solving
18 = -3 + -1z

Solving for variable 'z'.

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

Add 'z' to each side of the equation.
18 + z = -3 + -1z + z

Combine like terms: -1z + z = 0
18 + z = -3 + 0
18 + z = -3

Add '-18' to each side of the equation.
18 + -18 + z = -3 + -18

Combine like terms: 18 + -18 = 0
0 + z = -3 + -18
z = -3 + -18

Combine like terms: -3 + -18 = -21
z = -21

Simplifying
z = -21

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