book Maths Puzzle Numerical Ability

please help
solve:
a over a+1 + 2a + 4 over a^2-3a-4 = 2 over a-4
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Please Help!!-Thank You

Abox is to be formed from a rectangular piece of sheet metal by cutting squares measuring 5in on a side and then folding the sides. The piece of sheet me i MADE The mistake when I was solving equations and did this

The equation 2(x-2) = x +3
First step in solving 2x-2=x+3

What error did I make? How could I avoided it? thanks