Question

45-59+(-45)+55
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Answer 1

= - 4

Answer 2

\(=\left[45+\left(-45\right)\right]+\left(-59+55\right)\\ =0+\left(-4\right)=-4\)

Answer 3

\(45-59+\left(-45\right)+55\)

\(=\left(-14\right)+\left(-45\right)+55\)

\(=\left(-59\right)+55\)

\(=-4\)