12*7=84
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0.3 x = 84
The conjugate of (84-3i) is (84+3i). This gives you a real number when multiplied.
84 = 2 x 2 x 3 x 7
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x/1 + x/x = 84 where x = a prime number that is divisible by 1 and itself. Then find common denominator of 1x. Then we have x squared/1x + x/1x = 84. To simplify this will be x squared + x/1x = 84. The this becomes 1 + x = 84. Then x = 83. The prime numbers are 1 and 83 which fit the equation.