72=N+51

Solution for 72=N+51 equation:

Simplifying
72 = N + 51

Reorder the terms:
72 = 51 + N

Solving
72 = 51 + 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.
72 + -1N = 51 + N + -1N

Combine like terms: N + -1N = 0
72 + -1N = 51 + 0
72 + -1N = 51

Add '-72' to each side of the equation.
72 + -72 + -1N = 51 + -72

Combine like terms: 72 + -72 = 0
0 + -1N = 51 + -72
-1N = 51 + -72

Combine like terms: 51 + -72 = -21
-1N = -21

Divide each side by '-1'.
N = 21

Simplifying
N = 21