Question

Ann is x years old and her sister is 2 years older. If the product of their ages 80. Form an equation in x and solve to find the age of each.

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I got up to,

x + 2x = 80
x + 2x - 80 = 0

and now im confused... this is for an exam, help?
product means multiply:

x(x+2) = 80
Note that 8*10 = 80

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