exam Maths Puzzle Numerical Ability

I need help with 3a/a+1 + 4/a-2 =3

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exam Other Question

Suppose you have 12 coins that total 32 cents. Some of the coins are nickels and the rest are pennies. How many of each coin do you have? (a+bi)^2=2i
then what are the possible values of a and b?