20-3z=5

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Solution for 20-3z=5 equation: 


Simplifying
20 + -3z = 5

Solving
20 + -3z = 5

Solving for variable 'z'.

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

Add '-20' to each side of the equation.
20 + -20 + -3z = 5 + -20

Combine like terms: 20 + -20 = 0
0 + -3z = 5 + -20
-3z = 5 + -20

Combine like terms: 5 + -20 = -15
-3z = -15

Divide each side by '-3'.
z = 5

Simplifying
z = 5

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