Equations with variables on both sides

This lecture series shows how you can apply the principle of doing the same thing to both sides of the equation to equations with variables on both sides. Watch the videos and complete the interactive exercise sets.

Why we do the same thing to both sides: Variable on both sides

Source: Khan Academy, https://www.khanacademy.org/math/algebra-home/alg-basic-eq-ineq#alg-variables-on-both-sides
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