Multiply both sides of the equation by .

Cancel the common factor of .

Factor out of .

Cancel the common factor.

Rewrite the expression.

Multiply .

Multiply by .

Combine and .

Move the negative in front of the fraction.

Add to both sides of the equation.

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Move to the left of .

Add and .

Since the expression on each side of the equation has the same denominator, the numerators must be equal.

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Divide by .

Solve for x x/2=21/10-x/5