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100/x=90
We move all terms to the left:
100/x-(90)=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-90*x+100=0
We add all the numbers together, and all the variables
-90x+100=0
We move all terms containing x to the left, all other terms to the right
-90x=-100
x=-100/-90
x=1+1/9
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