The product of Rehan's age (in years) $5$ years ago and his age $7$ years from now, is one more than twice his present age. Find his present age.

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Step 1: Let Rehan's present age be $x$ years. $(x - 5)(x + 7) = 2x + 1$
Step 2: $\Rightarrow x^2 + 2x - 35 = 2x + 1 \Rightarrow x^2 = 36$
Step 3: $\Rightarrow x = 6$. Rehan's present age is $6$ years.

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