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`-3.5+456=0`

We simplify the equation to the form, which is simple to understand

-3.5+456=0

We move all terms containing to the left and all other terms to the right.

0=0+3.5-456

We simplify left and right side of the equation.

0=-452.5

0=-452.5

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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