15=12-z

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Solution for 15=12-z equation:


Simplifying
15 = 12 + -1z

Solving
15 = 12 + -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.
15 + z = 12 + -1z + z

Combine like terms: -1z + z = 0
15 + z = 12 + 0
15 + z = 12

Add '-15' to each side of the equation.
15 + -15 + z = 12 + -15

Combine like terms: 15 + -15 = 0
0 + z = 12 + -15
z = 12 + -15

Combine like terms: 12 + -15 = -3
z = -3

Simplifying
z = -3

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