Add to both sides of the equation.

Factor out of .

Factor out of .

Factor out of .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Solve for v v=7ry^3-2rv

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# Solve for v v=7ry^3-2rv

Add to both sides of the equation.

Factor out of .

Factor out of .

Factor out of .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Solve for v v=7ry^3-2rv