Question 1025231
Do you mean:
The sum of three numbers is 3, where the second is 7 less than the first and  the third is 3 more than the first.  Find the numbers 
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F=first number; S=second number=F-7; T=third number=F+3
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{{{F+S+T=3}}}
{{{F+(F-7)+(F+3)=3}}}
{{{3F-4=3}}}
{{{3F=7}}}
{{{F=7/3}}}
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{{{S=F-7}}}={{{(7/3)-(21/3)=-(14/3)}}}
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{{{T=F+3}}}={{{(7/3)+(9/3)=16/3}}}
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ANSWER: The first number is {{{7/3}}}; the second number is {{{-(14/3)}}}; the third number is {{{16/3}}}
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CHECK:
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{{{F+S+T=3}}}
{{{(7/3)+(-14/3)+(16/3)=3}}}
{{{(9/3)=3}}}
{{{3=3}}}