book Maths Puzzle Numerical Ability

PLease help me resolve this:

4/a+2 -5/a+2 =1
x2+7x = 12

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book Other Question

Solve the system by addition

5x + 9y = -12
x - 2y = 10 What is the discriminant to determine how many real number solutions the quadratic equation -4j^2+3j-28=0 has