[z]-30=20

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Solution for [z]-30=20 equation: 


Simplifying
[z] + -30 = 20
z + -30 = 20

Reorder the terms:
-30 + z = 20

Solving
-30 + z = 20

Solving for variable 'z'.

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

Add '30' to each side of the equation.
-30 + 30 + z = 20 + 30

Combine like terms: -30 + 30 = 0
0 + z = 20 + 30
z = 20 + 30

Combine like terms: 20 + 30 = 50
z = 50

Simplifying
z = 50

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