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Step-by-step explanation:
A=6 B=12 C=2.5
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Step-by-step explanation:
(a)3n+7=25
3n=25-7
3n=18
n=18/3
n=6
(b)2p -1=23
2p=23+1
2p=24
p=24/2
p=12
(c)12p-5=25
12p=25+5
12p=30
p=30/12
p=5/4