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9x-x+0,9y-y-9x=-x-0,1y=-(-1/5)-0,1y=1/5-0,1y
z-1/2p-1/2z+5p-5=4 1/2p+1/2z-5=4 1/2p+1/2*(-1/2)-5=4 1/2p-1/4-5=4 1/2p-5 1/4