book Maths Puzzle Numerical Ability

can you please solve this equation 11(4-6y)+5(13y+1)=9

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I am having difficulty solving the following problem. The instructions are
Factor the polynomial completely
3x^2 + 6x + 3

Thank you Hassan invested $7000 for one year. He invested part of it in a high-risk fund the pay 7% interst.At the endof one year he earned $ 730 in simple interst. How much did he invest in