exam Maths Puzzle Numerical Ability

(10+21y+10y^2)/(2y+3)

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can you solve this? i just really need it.
5x^5+9x^4-3x^3+10 divided by x^2+4x+5
solve this using the synthetic method.

P.S.
please show me the solutions.
thank you. this problem was a little confuseing i dont know how to sovle this one!! but i do think think answer is either cancels out to 0 or x+y can some one help?
(x-y/x+y)+(x+y/x-y)