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1*2*3*4*5*6*7=x
We move all terms to the left:
1*2*3*4*5*6*7-(x)=0
We add all the numbers together, and all the variables
-1x+5040=0
We move all terms containing x to the left, all other terms to the right
-x=-5040
x=-5040/-1
x=+5040
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