81-2*n=4*n+9

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Solution for 81-2*n=4*n+9 equation:


Simplifying
81 + -2n = 4n + 9

Reorder the terms:
81 + -2n = 9 + 4n

Solving
81 + -2n = 9 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
81 + -2n + -4n = 9 + 4n + -4n

Combine like terms: -2n + -4n = -6n
81 + -6n = 9 + 4n + -4n

Combine like terms: 4n + -4n = 0
81 + -6n = 9 + 0
81 + -6n = 9

Add '-81' to each side of the equation.
81 + -81 + -6n = 9 + -81

Combine like terms: 81 + -81 = 0
0 + -6n = 9 + -81
-6n = 9 + -81

Combine like terms: 9 + -81 = -72
-6n = -72

Divide each side by '-6'.
n = 12

Simplifying
n = 12

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