30-72=10z-4

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Solution for 30-72=10z-4 equation:


Simplifying
30 + -72 = 10z + -4

Combine like terms: 30 + -72 = -42
-42 = 10z + -4

Reorder the terms:
-42 = -4 + 10z

Solving
-42 = -4 + 10z

Solving for variable 'z'.

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

Add '-10z' to each side of the equation.
-42 + -10z = -4 + 10z + -10z

Combine like terms: 10z + -10z = 0
-42 + -10z = -4 + 0
-42 + -10z = -4

Add '42' to each side of the equation.
-42 + 42 + -10z = -4 + 42

Combine like terms: -42 + 42 = 0
0 + -10z = -4 + 42
-10z = -4 + 42

Combine like terms: -4 + 42 = 38
-10z = 38

Divide each side by '-10'.
z = -3.8

Simplifying
z = -3.8

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