3+z=18

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Solution for 3+z=18 equation: 


Simplifying
3 + z = 18

Solving
3 + z = 18

Solving for variable 'z'.

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

Add '-3' to each side of the equation.
3 + -3 + z = 18 + -3

Combine like terms: 3 + -3 = 0
0 + z = 18 + -3
z = 18 + -3

Combine like terms: 18 + -3 = 15
z = 15

Simplifying
z = 15

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