13=9-z

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Solution for 13=9-z equation:


Simplifying
13 = 9 + -1z

Solving
13 = 9 + -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.
13 + z = 9 + -1z + z

Combine like terms: -1z + z = 0
13 + z = 9 + 0
13 + z = 9

Add '-13' to each side of the equation.
13 + -13 + z = 9 + -13

Combine like terms: 13 + -13 = 0
0 + z = 9 + -13
z = 9 + -13

Combine like terms: 9 + -13 = -4
z = -4

Simplifying
z = -4

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