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Answer :

The answer is the third option. ʘwʘ
It’s d=13

Let’s solve it step by step:
5d+6=71

#1: subtract 6 from both sides
5d+6-6= 71-6
Making it 5d =65

#2: divide both sides by 5
5d/5 = 65/5

Which equals :d=13