9 more than (this means the same thing as addition or sum, so replace this with an addition sign) the product of (product of means that it's multiplying two numbers together. In this case the two numbers are 4 and x) 4 and x is (this is another word for equal to, so replace with an equal sign) 20
This said the algebraic equation is:
9 + 4x = 20
Hope this helped!
~Just a girl in love with Shawn Mendes