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x/g=9/10
10x=9g
10x-9g=0 (Ec. 1)
Sacamos 19 gallinas:
x/(g-19)=10/9
9x=10(g-19)
9x=10g-190
9x-10g=-190 (Ec. 2)
Por igualación. Despejamos x de ambas e igualamos:
x=9g/10
x=(10g-190)/9
9g/10=(10g-190)/9
81g=100g-1900
-19g=-1900
g=-1900/-19
g=100
Sustituimos g=100 en el despeje de 1:
x=9g/10
x=9(100)/10
x=90
100 gallinas y 90 patos inicialmente.