Answer:
6. k=-18
9. a=-6
12. d= 24
Explanation:
6. k/6 +8=5
first subtract 8
k/6= -3
now multiple by the reciprocal of k/6 which is 6
k=-18
9. 9+a/6=8
a/6= -1
a=-6
12. d/4- 9= -3
d/4=6
d= 24
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