Graphic algebra problems. Normal

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3 x vaca.png - 2 = 16 - 3
gato.png - 3 = 12 - 1 - 2 x vaca.png
gallo.png - 2 = 11 + 1 - 2 x gato.png
Can you calculate the value of each of the elements?
vaca.png =
gato.png =
gallo.png =