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2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17=x
We move all terms to the left:
2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17-(x)=0
We add all the numbers together, and all the variables
-1x+355687428096000=0
We move all terms containing x to the left, all other terms to the right
-x=-355687428096000
x=-355687428096000/-1
x=+3.55687428096E+14
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