exam Maths Puzzle Numerical Ability

2a+6/(a^2+6a+9)+1/a+3




Please Help me, I need to understand how to do these kinds of problems. . .

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exam Other Question
Several students decide to start a T-shirt company. After initial expenses of $280, they purchase each T-shirt for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even? 4/2x=2/(1-3x)