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49000/x=21000/3
We move all terms to the left:
49000/x-(21000/3)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
49000/x-7000=0
We multiply all the terms by the denominator
-7000*x+49000=0
We add all the numbers together, and all the variables
-7000x+49000=0
We move all terms containing x to the left, all other terms to the right
-7000x=-49000
x=-49000/-7000
x=+7
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