50
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38-50 = -12
38 + 12 = 50:D
38
There is no need to estimate: 38 - 12 = 38 - (10 + 2) = 38 - 10 - 2 = 28 - 2 = 26.
38/s - 7 = 12 multiply through by s 38 - 7s = 12s 38 = 19s 2 = s check 38/2 - 7 = 12 19 - 7 = 12 12 = 12 checks