exam Maths Puzzle Numerical Ability

Please help me sdivide and simplify: (x^2+2x-1)/ (x+3) = 0.

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exam Other Question

The number (2/3) belongs to what subsets of real numbers? Please help me find all real soultions for this equation.
{{2y^2=15+y}}}

The teacher said there are two answers which are 3 and -5/2. I can not get to either of these answers.

Thank you