1/9 + 4/9 = 5/9
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9 is written 9/1 9/1 x 4/3 9 x 4 = 36 1 x 3 = 3 36/3 reduced is 12/1 = 12
n + 1/4 = 9/20 n + 5/20 = 9/20 n = 4/20 = 1/5
4x-9=k 4x=k+9 Divide by 4 to isolate the x x=(1/4)k+(9/4) x=1/4 k+ 9/4
(4 - 8) / (9 - 5) = -1 or -1/1
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