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a=3是直線ax+2y+3a=0和直線3x+(a-1)y=a-7平行且不重合的______________.

a=3是直線ax+2y+3a=0和直線3x+(a-1)y=a-7平行且不重合的         .

a=3是直線ax+2y+3a=0和直線3x+(a-1)y=a-7平行且不重合的_________.

a=3是直線ax+2y+3a=0和直線3x+(a-1)y=a-7平行且不重合的___________.

a=3是直線ax+2y+3a=0和直線3x+(a-1)y=a-7平行且不重合的________.