Answer:
Well using key words/phrases here
More than which means add.
Product means multiply.
Is means equal to.
So if we combine this
5 + c * 4 = 7
Well 5 more then the product of a number which is (c) and 4 is 7
That would be your eqaution.
To solve, just solve normally like any algebraic equation/
5+4c = 7
4c=2
C= 1/2
1/2 or 0.5 is the unknown number or C