book Maths Puzzle Numerical Ability

I need help on this equation:

y=[x+3]-4=

I need the x-intercepts(the negative and positive).....im stuck at that part..

Thanks

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book Other Question

F(x)=x/(x+1)then
f(x-1)= how do u solve a polynomial equation for x?

Ex:8/x^2-4 + 2/x = x/x-4

the slashes are division... so it would be 8 over x squared -4 and the u add 2 over x