123=321+e

Solution for 123=321+e equation:

Simplifying
123 = 321 + e

Solving
123 = 321 + e

Solving for variable 'e'.

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

Add '-1e' to each side of the equation.
123 + -1e = 321 + e + -1e

Combine like terms: e + -1e = 0
123 + -1e = 321 + 0
123 + -1e = 321

Add '-123' to each side of the equation.
123 + -123 + -1e = 321 + -123

Combine like terms: 123 + -123 = 0
0 + -1e = 321 + -123
-1e = 321 + -123

Combine like terms: 321 + -123 = 198
-1e = 198

Divide each side by '-1'.
e = -198

Simplifying
e = -198