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y= historietas
x + y = 800 despejamos x ⇒ x = 800 - y
3.500 x + 6.700 y = 4 000 000
sustituyendo
3.500 (800 - y) + 6.700 y = 4 000 000
2800000 - 3.500y + 6700y = 4 000 000
3.200 y = 1 200 000
y = 375
luego:
x = 800 - 375
x= 425