There are several unknowns (x's) in one pan in the balance or scales (on one side of the equation). What to do? It is simple!
The last part of this lesson is here:
• Modeling equations with a pan balance: unk...
In it, you will learn to remove the same amount of weight or unknowns from both sides of the equation.
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Math Mammoth 5th grade curriculum:
https://www.mathmammoth.com/complete/...