20=15-z

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Solution for 20=15-z equation:


Simplifying
20 = 15 + -1z

Solving
20 = 15 + -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.
20 + z = 15 + -1z + z

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

Add '-20' to each side of the equation.
20 + -20 + z = 15 + -20

Combine like terms: 20 + -20 = 0
0 + z = 15 + -20
z = 15 + -20

Combine like terms: 15 + -20 = -5
z = -5

Simplifying
z = -5

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