a) 3 b) 16 c) 0 d) 70
Work Step by Step
a) $12-9=3$ $3+9=12\checkmark$ b) $22-7=15$ $15+7=22\checkmark$ c) $35-35=0$ $0+35=35\checkmark$ d) $70-0=70$ $70+0=70\checkmark$
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