Negation of a double negative is not ... Mind Blown

Probability Level 2

How many ways can a subset of the ++ signs in the following expression be turned into - signs in such a way that the equation becomes valid?

1+1+1+1+1+1+1+1+1+1+1+1=41+1+1+1+1+1+1+1+1+1+1+1 = 4

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