Answer:
Answer is (d) 3
Step-by-step explanation:
(7/12)^-4 + (7/12)^3x = (7/12)^5
(7/12)^(-4+3x) = (7/12)^5
-4+3x = 5 [divided by 7/12 everypart]
3x =5+4
3x=9
x=9/3
x=3
