12+3x=81

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Solution for 12+3x=81 equation: 


Simplifying
12 + 3x = 81

Solving
12 + 3x = 81

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 3x = 81 + -12

Combine like terms: 12 + -12 = 0
0 + 3x = 81 + -12
3x = 81 + -12

Combine like terms: 81 + -12 = 69
3x = 69

Divide each side by '3'.
x = 23

Simplifying
x = 23

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