`8/5x - x = -9/10`
`=> 8/5x - 1x = -9/10`
`=> 8/5x - 5/5x = -9/10`
`=> 3/5x = -9/10`
`=> x = -9/10 : 3/5`
`=> x = -9/10 xx 5/3`
`=> x = -3/2`
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