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(5x/x-3)+(4/x+3)=(90/x^2-9)
We move all terms to the left:
(5x/x-3)+(4/x+3)-((90/x^2-9))=0
Domain of the equation: x-3)!=0
x∈R
Domain of the equation: x+3)!=0
x∈R
Domain of the equation: x^2-9))!=0We get rid of parentheses
x∈R
5x/x+4/x-((90/x^2-9))-3+3=0
We calculate fractions
We do not support expression: x^3
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