"k", in this case, may mean "kilo", that is, "times thousand".
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Put it into two binomilals that multipy together to create the polynomial. For example: 5K(squared)-2k-7 is factored out as: (5k+1)(-7K+1)
-12 + 5k = -925k + (-12) = -925k = -92 + 125k = 80k = -80/5k = -16
5k + 2 = -2 Therefore, 5k = -4 k = -4/5 k = -0.8
2*5k or 10k are equivalent.
5k - 2*(h - 8k) = 5k - 2h + 16k = 21k - 2h