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Using the balance model with negative terms in an equationIt is not so easy to portray negatives in an equation with the balance model because in the natural we don't have any 'negative weight', but you can think of the negatives as holes or empty spots that when filled with positives, they become nothing or zero.
The same thing can happen with the blocks or x's - they can be negative too! Try the following example:
Checking the solution: we substitute x = -4 to the equation 2x + 3 = -5: 2(-4) + 3 = -5 -8 + 3 = -5 -5 = -5 So it was the right solution.
More exercises - you can solve these equations with the help of the balance model or just with pencil and paper
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