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I assume that "I" is a variable2+5i+6+3i7i+6+3i10i+616i is the answer
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i is the Imaginary Unit, equal to sqrt(-1). So i and any real number multiplied by i will all be imaginary numbers. Here are some: i, -i, 5i, -3i, i*pi, etc.
[ sqrt(-25) / sqrt(9) ] - [ sqrt(-1) ] = j5/3 - j1 = j 2/3