Ответ:
1) 20-14d=-16-10d
20+16=14d-10d
36=4d
d=9
2)2c/5=8/5
10c=40
c=4
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Ответ:
1) 20-14d=-16-10d
20+16=14d-10d
36=4d
d=9
2)2c/5=8/5
10c=40
c=4