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3 x + 4 y = 0
3 x = -4 y
x = -4 y / 3
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2 x + 3y = -1
2 ( -4 y / 3 ) + 3 y = -1
y / 3 = -1
y = -3
2 x + 3 y = -1
2 x + 3 ( -3 ) = -1
2 x-9=-1
2 x=8
x= 8 / 2
x = 4 <----- respuesta