X - 2x - 5 = 3 (x + 5)

x = - 5

Step-by-step explanation:

Using the given equation:

x - 2x - 5 = 3 (x + 5)

Distribute: x - 2x - 5 = 3x + 15

Combine like terms: - x - 5 = 3x + 15

Add 'x' to both sides: - x - 5 + x = 3x + 15 + x or - 5 = 4x + 15

Subtract 15 from both sides: - 5 - 15 = 4x + 15 - 15 or - 20 = 4x

Divide both sides by 4: - 20/4 = 4x/4 or x = - 5