13+c = -39
c = -39-13
c = -52
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7q+13 = 52 7q = 52-13 7q = 39 q = 39/7
4 - (-39) = 4 + 39 = 43
-52 + 39 = -13
273
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.