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Step-by-step explanation:
v = Victor's age
m = Maria's age
v = 3m
v - 10 = 7(m - 10)
3m - 10 = 7m - 70
60 = 4m
m = 15
v = 3m = 3×15 = 45
Victor is 45 years old. Maria is 15 years old.