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x-\frac{x^{2}+3}{x+5}=0
Subtract \frac{x^{2}+3}{x+5} from both sides.
\frac{x\left(x+5\right)}{x+5}-\frac{x^{2}+3}{x+5}=0
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{x+5}{x+5}.
\frac{x\left(x+5\right)-\left(x^{2}+3\right)}{x+5}=0
Since \frac{x\left(x+5\right)}{x+5} and \frac{x^{2}+3}{x+5} have the same denominator, subtract them by subtracting their numerators.
\frac{x^{2}+5x-x^{2}-3}{x+5}=0
Do the multiplications in x\left(x+5\right)-\left(x^{2}+3\right).
\frac{5x-3}{x+5}=0
Combine like terms in x^{2}+5x-x^{2}-3.
5x-3=0
Variable x cannot be equal to -5 since division by zero is not defined. Multiply both sides of the equation by x+5.
5x=3
Add 3 to both sides. Anything plus zero gives itself.
x=\frac{3}{5}
Divide both sides by 5.