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How do you -3/(x*x^3) in partial fractions?

An expression to simplify:

The solution

You have entered [src]
-3  
----
   3
x*x 
$$- \frac{3}{x x^{3}}$$
-3/x^4
General simplification [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Fraction decomposition [src]
-3/x^4
$$- \frac{3}{x^{4}}$$
-3 
---
  4
 x 
Numerical answer [src]
-3.0/x^4
-3.0/x^4
Powers [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Trigonometric part [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Common denominator [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Combinatorics [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Combining rational expressions [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Assemble expression [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Expand expression [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4
Rational denominator [src]
-3 
---
  4
 x 
$$- \frac{3}{x^{4}}$$
-3/x^4