Which of the following pairs of equation...

Which of the following pairs of equations has a unique solution ?

`3x+10y-27=0`

`2x+3y-14=0`

`{:(5x+10y-24=0),(6x+20y-81=0),(2x+4y-27=0):}`

`{:(4x+5y-12=0),(7x+4y-40=0),(6x+(15y)/(2)-18=0):}`

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