30 - 10 k = 20
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4 hours and 20 minutes + k*12 hours where k is an integer.
First, factor out the k. So, k(4+2) = 30 or 6k = 30 Then divide by 6. k = 30/6 = 5 So k = 5.
2k = 5k-30 Subtract 5k from both sides: -3k = -30 Divide both sides by -3 to find the value of k remembering that a minus divided into a minus becomes a plus: k = 10
If: k/2 + 9 = 30 Then: k = 42
k stands for a thousand.