book Maths Puzzle Numerical Ability

I need help with Algebra question concerning "domain" examples
find the domain of the function;

y=1/2x
y=1/x+3

Thanks, Tony

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book Other Question

Solve rational expression:

x plus 1 over x minus 3 equals 4 minus 12 over x squared minus 2x minus 3.

the 4 is separate (in the middle of the two equations).

Please explai given g(x)= -2x^2-8x+12.......what are the solutuions for g(x)=0, and g(x)<0.