`(-1/5-1+1/2)-(2-2/3+1/2)+(1+1/5-2/3)`
`= -1/5-1+1/2-2+2/3-1/2+1+1/5-2/3`
`=(-1/5 + 1/5) +(1/2-1/2)+(2/3-2/3)-1-2+1`
`=0+0+0-1-2+1`
`=-2`
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