21 chickens and 23 goats=44
21x2=42 23x4=92
42+92 = 134 legs
x=goats y= chikens goats 4 legs chickens 2 legs
x+y=44 x=44-y
4(44-y) + 2(y) =134
176-4y +2y = 134
176-2y=134
-2y= -42
-y= -21
y=21
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