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Ivanshal [37]
4 years ago
13

3" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
Sauron [17]4 years ago
6 0
D = -21

multiply both sides by 7
1/7d (7) = -3 (7)

reduce with greatest common factor
d = 7(-3)

change signs
d = -7(3)

solve
d=-21
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