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Mathematics 8 Online
OpenStudy (anonymous):

AD = AB + BD 20y - 9 = 5y - 4 + 7y + 3 20y - 9 = 12y - 1 8y = 8 y = 1 AB = 5*1 - 4 = 1 BD = 7*1 + 3 = 10 AD = 20*1 - 9 = 11

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