13+5=18 - 18-5=13, 20-4=16 - 16+4=20, 36-4=32 - 32+4=36, 20/5=4 - 4x5=20, 13x3=39 - 39/3=13, 20/10=2 - 2x10=20, 20x4=80 - 80/4=20, 13-5=8 - 8+5=13,

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