13 (y - 4) - 4 (y-6) + 5 (y-9)=0
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13 (y-4) - 4 (y-6) + 5 (y-9) = 0
13y - 52 - 4y + 24 + 5y - 45 = 0
14y - 73 = 0
14y = 73
y = 73/14
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