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itu semua dikali dua jadi,
10x-1-2 = -x-9
10x-3=-x-9
9x=-6
x = -2/3
5x+(1/2)x=-(9/2)+(15/6)
(11/2)x=-(27/6)+(15/6)
(11/2)x=-(12/6)
x=-2 × (2/11)
x= -4/11