+ - +
__________[-1]__________[3]________
///////////////////// ///////////////////
x ∈ ( - ∞ ; - 1] ∪ [3 ; + ∞)
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+ - +
__________[-1]__________[3]________
///////////////////// ///////////////////
x ∈ ( - ∞ ; - 1] ∪ [3 ; + ∞)