3/8 + n = 7/8.
Pls help

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?