4k.
You can replace "k" and other variables with a familiar object if it helps you to understand why. 5 cookies - a single cookie = 4 cookies, for example.
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11 - 5k. If k is a number then substitute it in. Example if k were to equal 2, then 11 - 5*2 = 11-10 = 1. It depends on the value of k.
5k + 2 = -2 Therefore, 5k = -4 k = -4/5 k = -0.8
K, in money, stands for thousand. So, 5K dollars is 5 thousand dollars.
6 divided by the sum of 4 times x and 5 times k is equal to 6 times the reciprocal of (4x + 5k).
k - k = 0