Graphic algebra problems. Normal

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1 = 8 + 3 - 2 x snork feet.png
umberella.png - 1 = 16 - 2 - 2 x snork feet.png
chair 2.png + 2 = 20 - 3 - 2 x umberella.png
Can you calculate the value of each of the elements?
snork feet.png =
umberella.png =
chair 2.png =