Answer :

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For the answer to be 130, change this....:
    310 – 20 ÷ 2 × 5 + 13
....into this:
    310 – 20 ÷ 2 × (5 + 13)

310 – 20 ÷ 2 × (5 + 13)
310 – 20 ÷ 2 × 18
310 -  10 x 18
310 -  180
=        130

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