30+12=e-42

Solution for 30+12=e-42 equation:

Simplifying
30 + 12 = e + -42

Combine like terms: 30 + 12 = 42
42 = e + -42

Reorder the terms:
42 = -42 + e

Solving
42 = -42 + 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.
42 + -1e = -42 + e + -1e

Combine like terms: e + -1e = 0
42 + -1e = -42 + 0
42 + -1e = -42

Add '-42' to each side of the equation.
42 + -42 + -1e = -42 + -42

Combine like terms: 42 + -42 = 0
0 + -1e = -42 + -42
-1e = -42 + -42

Combine like terms: -42 + -42 = -84
-1e = -84

Divide each side by '-1'.
e = 84

Simplifying
e = 84