18=20-z

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Solution for 18=20-z equation:


Simplifying
18 = 20 + -1z

Solving
18 = 20 + -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 = 20 + -1z + z

Combine like terms: -1z + z = 0
18 + z = 20 + 0
18 + z = 20

Add '-18' to each side of the equation.
18 + -18 + z = 20 + -18

Combine like terms: 18 + -18 = 0
0 + z = 20 + -18
z = 20 + -18

Combine like terms: 20 + -18 = 2
z = 2

Simplifying
z = 2

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