(3.0+1.5L)*(3.3*10-5)*(15*60)=21.43

Solution for (3.0+1.5L)*(3.3*10-5)*(15*60)=21.43 equation:

Simplifying
(3.0 + 1.5L)(3.3 * 10 + -5)(15 * 60) = 21.43

Multiply 3.3 * 10
(3.0 + 1.5L)(33 + -5)(15 * 60) = 21.43

Combine like terms: 33 + -5 = 28
(3.0 + 1.5L)(28)(15 * 60) = 21.43

Multiply 15 * 60
(3.0 + 1.5L) * 28(900) = 21.43

Reorder the terms for easier multiplication:
28 * 900(3.0 + 1.5L) = 21.43

Multiply 28 * 900
25200(3.0 + 1.5L) = 21.43
(3.0 * 25200 + 1.5L * 25200) = 21.43
(75600 + 37800L) = 21.43

Solving
75600 + 37800L = 21.43

Solving for variable 'L'.

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

Add '-75600' to each side of the equation.
75600 + -75600 + 37800L = 21.43 + -75600

Combine like terms: 75600 + -75600 = 0
0 + 37800L = 21.43 + -75600
37800L = 21.43 + -75600

Combine like terms: 21.43 + -75600 = -75578.57
37800L = -75578.57

Divide each side by '37800'.
L = -1.999433069

Simplifying
L = -1.999433069