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We need to isolate the dependent variable $x$, we can do that by simultaneously subtracting $5$ from both sides of the equation
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$-2x^3+5-5=21-5$
Learn how to solve equations problems step by step online. Solve the equation 5-2x^3=21. We need to isolate the dependent variable x, we can do that by simultaneously subtracting 5 from both sides of the equation. Canceling terms on both sides. Divide both sides of the equation by -2. Simplifying the quotients.