To solve the equation, we will first distribute the 0.3 to the terms inside the parentheses:

0.3 * 230 - 0.3 * (15 - 5x) = 390

69 - 0.3 * 15 + 0.3 * 5x = 390

Next, simplify the equation:

69 - 4.5 + 1.5x = 390

Combine like terms:

-4.5 + 69 + 1.5x = 390

64.5 + 1.5x = 390

Now, isolate the variable by subtracting 64.5 from both sides:

1.5x = 390 - 64.5

1.5x = 325.5

Finally, divide both sides by 1.5 to solve for x:

x = 325.5 / 1.5

x ≈ 217