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72/x=18
We move all terms to the left:
72/x-(18)=0
Domain of the equation: x!=0We multiply all the terms by the denominator
x∈R
-18*x+72=0
We add all the numbers together, and all the variables
-18x+72=0
We move all terms containing x to the left, all other terms to the right
-18x=-72
x=-72/-18
x=+4
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