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Writing Expressions and Equations
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When equations contain unknowns that appear two or more times, they must be combined.
To combine unknowns, they must be on the same side of the equation. If they are not, you must move them all to the same side. Once the unknowns are on the same side of the equation, you can add or subtract their coefficients.
To combine unknowns, they must be on the same side of the equation. If they are not, you must move them all to the same side. Once the unknowns are on the same side of the equation, you can add or subtract their coefficients.