\(=-\dfrac{1}{3}+\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{3}{4}=1\)
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\(\dfrac{-4}{12}-\left(-\dfrac{13}{39}-0.25\right)+0.75\)
\(=\dfrac{-1}{3}+\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{3}{4}\)
=1
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