3x+81=123

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Solution for 3x+81=123 equation: 


Simplifying
3x + 81 = 123

Reorder the terms:
81 + 3x = 123

Solving
81 + 3x = 123

Solving for variable 'x'.

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

Add '-81' to each side of the equation.
81 + -81 + 3x = 123 + -81

Combine like terms: 81 + -81 = 0
0 + 3x = 123 + -81
3x = 123 + -81

Combine like terms: 123 + -81 = 42
3x = 42

Divide each side by '3'.
x = 14

Simplifying
x = 14

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