21=-7e

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Solution for 21=-7e equation:


Simplifying
21 = -7e

Solving
21 = -7e

Solving for variable 'e'.

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

Add '7e' to each side of the equation.
21 + 7e = -7e + 7e

Combine like terms: -7e + 7e = 0
21 + 7e = 0

Add '-21' to each side of the equation.
21 + -21 + 7e = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7e = 0 + -21
7e = 0 + -21

Combine like terms: 0 + -21 = -21
7e = -21

Divide each side by '7'.
e = -3

Simplifying
e = -3

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