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(x+17)21=x
We move all terms to the left:
(x+17)21-(x)=0
We add all the numbers together, and all the variables
-1x+(x+17)21=0
We multiply parentheses
-1x+21x+357=0
We add all the numbers together, and all the variables
20x+357=0
We move all terms containing x to the left, all other terms to the right
20x=-357
x=-357/20
x=-17+17/20
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