let

b = the present age of Brad

p = the present age of Pedro

Brad is 7 years older than Pedro

b = p + 7

Nine years ago Pedro's age was three-fourths of Brad's age at that time

p - 9 = (3/4)(b - 9)

by solving the system of equations

b = p + 7

p - 9 = (3/4)(b - 9)

we find

b = 37 years

p = 30 years

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Brad is 37 years old now.

Pedro is 30 years old now.