exam Maths Puzzle Numerical Ability

x^2-1/10 divide x+1/x-1

Can I cancel a x and 1?

x/10 divide 1/x?

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exam Other Question

Solve for x:
logbase9 x + -1/2 I thought the answer was x=3 but I was told that I was wrong:(
add express your answer in simpliest form

x-13
over
x^2-x-12
plus
3x-3
over
x^2-x-12

A)3
over
x-3
B)3
over
x+4
C)4
over
x-4
D)4
over
x+3