Answer:
44
Explanation:
x+(x-12)=76
2x-12=76
2x=76+12
2x=88
x=88/2
x=44
48 years old
Let x = Mikhail's age
then x-15 = Gabrielle's age
x + x-15 = 81
2x-15 = 81
2x = 96
x = 48 years old
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