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5b^9/a^3

Step-by-step explanation:

10/2=5

a^4/a^7 would be a negative so drop it down and make it a whole. 4 is less than 7 so you can't do 4-7. Instead do 7-4=3 bringing the b down.

b^6/b^-3 is a little tricky. You don't want a negative so instead bring it up and add it. 6+3=9 Down in the denominator the -3 is a negative but up top it becomes a positive.

5a^11b^9

Step-by-step explanation:

10a^4b^6 /2a^7b^3

5a^4b^6a^7b^3

5a^11b^9