- How do I make this trinomial a perfect square? X^2+12x+c?

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4(2x-3)-3(x-5)=x+7? I weigh 113lbs and just took 3 Excedrin and 2 200mg ibuprofen .. I'm scared to tell my parents but I also want to wake up in the morning..? How to differentiate mineral water from normal water without tasting them? And is the ratio 3 : 9
the same as 1 : 300? 3 cm : 1cm the same as 3 : 100?