(-18.65)+(-6.15)+18.75+(+6.15)

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(-18.65)+(-6.15)+18.75+(+6.15)

(-18.65)+(-6.15)+18.75+(+6.15)
(-18.65)+(-6.15)+18.75+(+6.15)

(-18.65)+(-6.15)+18.75+(+6.15)
(-18.65)+18.75 = 0.1
(-6.15)+(+6.15)=0