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Answer:
3/7 =12/n
3n=7×12
3n=84
n=84÷3
n=28
3/7= t/21
3×21=7t
63=7t
t=63÷7
t=9
3/7 =k-1/2k+10
3(2k+10)=7(k-1)
6k+30=7k-7
k=37
Step-by-step explanation: