X = 36 - Y
8 ( 36 - Y ) + 12Y = 399
288 - 8Y + 12Y = 399
4Y = 111
Y = 111 / 4
X = 36 -111 / 4 = 33 / 4
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8x+12y = 399
---------------------
-8x -8y = -288
8x + 12y = 399
----------------------- sumando
4y = 111
y = 111/4
x + 111/4 = 36
x = 36 -111/4
x = 33/4
X = 36 - Y
8 ( 36 - Y ) + 12Y = 399
288 - 8Y + 12Y = 399
4Y = 111
Y = 111 / 4
X = 36 -111 / 4 = 33 / 4
ESPERO HABERTE AYUDADO