(e+4)*3=21

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Solution for (e+4)*3=21 equation:


Simplifying
(e + 4) * 3 = 21

Reorder the terms:
(4 + e) * 3 = 21

Reorder the terms for easier multiplication:
3(4 + e) = 21
(4 * 3 + e * 3) = 21
(12 + 3e) = 21

Solving
12 + 3e = 21

Solving for variable 'e'.

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

Add '-12' to each side of the equation.
12 + -12 + 3e = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3e = 21 + -12
3e = 21 + -12

Combine like terms: 21 + -12 = 9
3e = 9

Divide each side by '3'.
e = 3

Simplifying
e = 3

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