book Maths Puzzle Numerical Ability

This is called a Literal Equation.
Solve (x+7)(y+4)=5 for x in the form x=ay+b/y+c

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Here are 3 questions that I am stuck on can you help? Thanks

Explain in your own words how to reverse FOIL when factoring a polynomial of the form ax + bx +c when a =1. Give an f(x)=3/5 +7