(-1.3)+(-2.64)+(+3.3)+(-1.36)

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(-1.3)+(-2.64)+(+3.3)+(-1.36)
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(-1.3)+(-2.64)+(+3.3)+(-1.36)
(-1.3)+(-2.64)+(+3.3)+(-1.36)

(-1.3)+(-2.64)+(+3.3)+(-1.36)
(-1.3)+(-2.64)+(+3.3)+(-1.36)
=-1.3-2.64+3.3-1.36
=2-4
=-2