8x-[2y+{3y+2(5y-x) }]
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8x-[2y+{3y+2(5y-x)}] = 0
8x-[2y+{3y+10y-2x}] = 0
8x-[2y+{13y-2x}] = 0
8x-[2y+13y-2x] = 0
8x-[15y-2x] = 0
8x-15y+2x = 0
10x-15y = 0
2x-3y = 0
x = 3y/2 and y = 2x/3
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