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3628800*9*8*7*6*5*4*3*2*1=x
We move all terms to the left:
3628800*9*8*7*6*5*4*3*2*1-(x)=0
We add all the numbers together, and all the variables
-1x+1316818944000=0
We move all terms containing x to the left, all other terms to the right
-x=-1316818944000
x=-1316818944000/-1
x=+1.316818944E+12
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