exam Maths Puzzle Numerical Ability

Find the sum or difference. - 11/12 - -7/15

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exam Other Question

I have a couple quick questions.

1.)Divide (30b^3+20b^2+25b+41)/(5b+5)

2.)Subtract and simplify (7-x/x-6)-(7x-9/6-x)
I got 6x-2/x-6 is theis correct or does it simplify even which equation describes the line with an undefined slope and containing the point (-3,-1)?

A) x=-3
B) y=-1
C) y=-3
D) y=-3x-1
E) x=-1