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-126/x=21
We move all terms to the left:
-126/x-(21)=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-21*x-126=0
We add all the numbers together, and all the variables
-21x-126=0
We move all terms containing x to the left, all other terms to the right
-21x=126
x=126/-21
x=-6
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