81-3x=9+21

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Solution for 81-3x=9+21 equation: 


Simplifying
81 + -3x = 9 + 21

Combine like terms: 9 + 21 = 30
81 + -3x = 30

Solving
81 + -3x = 30

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 = 30 + -81

Combine like terms: 81 + -81 = 0
0 + -3x = 30 + -81
-3x = 30 + -81

Combine like terms: 30 + -81 = -51
-3x = -51

Divide each side by '-3'.
x = 17

Simplifying
x = 17

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