let walmart = y
Exxon = x
x +y = 919.1 billion
x = y-19.3 billion
so y-19.3 +y = 919.1
2y-19.3=919.1
2y = 938.4
y=469.2 billion ( Walmart)
x= 469.2 -19.3 = 449.9 billion (Exxon)
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