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Hi,
Let x represent the son's present age
Question States*** Vijay's age Now is (x+23)
After 7 years: Both Vijay and Son are 7 years older
Vijay in 7yrs = twice(son 7 yrs older)

x + 30 = 2x + 14
16 = x, son's age. Vijay is 39 
CHECKING our answer***After 7 years...
46 = 2*23
Wish You the Best in your Studies.