Book Maths Puzzle Age Problem

I need help with this word problem.

A mother is five times as old as her son. If twice the age of the son is 3 years less than half of the age of the mother, how old are they?

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Book Other Question

How do I do the below problem?

(.04-.0008t)(50-t)=.5
Leo is 38 years older than Adam. Five times Adam`s age, when decreased by 5 is 1 more than Leo`s age. How old is each.