81-3=n

Solution for 81-3=n equation:

Simplifying
81 + -3 = n

Combine like terms: 81 + -3 = 78
78 = n

Solving
78 = n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
78 + -1n = n + -1n

Combine like terms: n + -1n = 0
78 + -1n = 0

Add '-78' to each side of the equation.
78 + -78 + -1n = 0 + -78

Combine like terms: 78 + -78 = 0
0 + -1n = 0 + -78
-1n = 0 + -78

Combine like terms: 0 + -78 = -78
-1n = -78

Divide each side by '-1'.
n = 78

Simplifying
n = 78