book Maths Puzzle Numerical Ability

HOW TO SOLVE THIS PROBLEM?
7a x 9b

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book Other Question

The question out of my book states: Find the quotients

(-3ab^2) Divided by (-9ab^2-6a^3b^3)

I divided -3ab^2 by -9ab^2 and -6a^3b^3 and I got =3ab + 2a^ show the graph of 5x+7y=35