X+3=-9x

Solve for x:

• Start: x + 3 = -9x
• Add 9x to both sides: 10x + 3 = 0
• Subtract 3: 10x = -3
• Divide by 10: x = -3/10 = -0.3

Check: Left = x + 3 = -0.3 + 3 = 2.7; Right = -9x = -9(-0.3) = 2.7. OK.

Answer: x = -3/10 (or -0.3).