6x-9=39 so 6x=48 and 8x6=48 so x=8
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24/39 = 8/13
13+c = -39 c = -39-13 c = -52
102
If you do do 4 × 13 = 39 you will get it wrong. Working it out: 4 × 13 = 52 To get 39, you need to calculate: 3 × 13 = 39.
If 3b = 39 thenb = 39/3b = 13.