11 3/8 - 7/8 = 7 1/6 - 3 4/9 =
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Start by dividing both sides by 2 to get 
. Doing the math on the right, keeping in mind that logs have an unwritten base of 10, gives us 
. Rewriting this in exponential form is 
. That means that x = 8. Not negative, only positive.