Combine the numerators over the common denominator.

Apply the distributive property.

Multiply by .

Subtract from .

Add and .

Subtract from .

Cancel the common factor of and .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Move the negative in front of the fraction.

Simplify (m-3n)/(6m^3n)-(m+3n)/(6m^3n)