exam Maths Puzzle Numerical Ability

Reduce to the lowest term if possible; state any restrictions on the variable

(3x+15)/(3xsquared+ 24x+45)

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Ok, last one I swear. If someone can just show me how to wrk this problem, I should be able to finish solving the rest of the problems I have to do this week. I just do not get thi 3x+2y=-6