Assuming you mean x-5=1 the answer would be x=6
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the pairs are 1 x 25 5 x 5
80 x/5 = 16 x/5 x 5/1 = 16 x 5/1 x = 80
1 x 1 x 175 1 x 5 x 35 1 x 7 x 25 5 x 5 x 7
with something called logarithms. So 1 = (1 + x)^5 log 1 = log ((1+x)^5) log 1 = 5 x log (1 +x) but log 1 = 0 therefore 0 = 5 x log(1+x) divide both sides by 5 and you get 0 = log (1+x) we know that log 1 = 0, therefore 1+ x = 1 and so x = 0