book Maths Puzzle Numerical Ability

Perform the indicated operations in the proper order:
-17 - ( -2)( -6) + (- 24)/( -3)

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book Other Question

Find the domain of the rational function.

8/x +3
Please help.
Subtract and write answer in simplest form.

y-2/y+3 - y/2y+6

I am getting y-4/2(y+3)

Is this right?