Question

This is from Khan academy I have to attach a PNG if you can help me solve it! Thank you!

Answer 1

Step-by-step explanation:

$\frac{5 {}^{ - 4x + 7} }{125 {}^{x} }$

$\frac{5 {}^{ - 4x + 7} }{5 {}^{3x} }$

$5 {}^{ - 4x + 7 - 3x}$

$5 {}^{ - 7x + 7}$