exam Maths Puzzle Numerical Ability

i need help on this question any help on how to do it and the solution is greatly appreciated thanks.

For all x not eqaul to -4, which of the following is equivalent to the exp

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exam Other Question

7/x-1+2/x+1=-2x/x^2-1 the math club bought 16 graphing calcaulators for $765. the super x model cost $40 and the super zx costs . how ,many super zx calcualtors were purchased?