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AWK (32)

{m=3ドル-2ドル;print m/=2ドル-1,ドル2ドル-1ドル*m}

Demo: http://ideone.com/kp0Dj

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bash (38)

awk '{m=3ドル-2ドル;print m/=2ドル-1,ドル2ドル-1ドル*m}'

Demo: http://ideone.com/tzFi8

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JavaScript (47 (削除) 48 (削除ここまで) (削除) 61 (削除ここまで) (削除) 67 (削除ここまで))

m=p(b=p(a=p(p=prompt)))-b;alert([m/=b-a,b-a*m])

​ Demo: http://jsfiddle.net/BT8bB/6/

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PHP (77)

<?fscanf(STDIN,'%d %d %d',$x,$y,$z);$a=($z-$y)/($y-$x);echo$a." ".($y-$a*$x);

Demo: http://ideone.com/lyiT0

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QBasic (34)

INPUT a,b,c
m=(c-b)/(b-a)
?m;b-m*a

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TI-83 Basic (41)

:Prompt A,B,C
:(C-B)/(B-A→M
:Disp M,B-A*M

Yes, the missing right parenthesis is on purpose. It's a well-known optimization technique that closing the parentheses before a STO operation is not necessary in TI-83 Basic programming.