-5•(-1,4)•(-9)

To simplify the expression \(-5 \cdot (-1.4) \cdot (-9)\), you can follow these steps:

1. Multiply \(-5\) and \(-1.4\): \[ -5 \cdot (-1.4) = 7 \]

2. Now multiply the result by \(-9\): \[ 7 \cdot (-9) = -63 \]

Therefore, the final result of the expression \(-5 \cdot (-1.4) \cdot (-9)\) is \(-63\).