book Maths Puzzle Numerical Ability

I would like an algebra expression for the following problem:

A number increased by 8 is the difference of the number and a product of the number multiplied by-4.

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book Other Question

Find 4 consecutive odd integers if the product of the two smaller integers is 112 less than the product of the two larger integers.
thanx please help me solve this equation: rs-rt=st-sr, for r ...............