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F=first; S=second=F+1
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3F=2S+10
3F=2(F+1)+10
3F=2F+2+10
3F=2F+12
F=12
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S=F+1=12+1=13
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ANSWER: 12 and 13 are the two numbers.
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CHECK:
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3F=2S+10
3(12)=2(13)+10
36=26+10
36=36
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