`[(10 - x) × 2 + 51] : 3 - 2 = 3`
`=> [(10 - x) × 2 + 51] : 3 = 3 + 2`
`=> [(10 - x) × 2 + 51] : 3 = 5`
`=> (10 - x) × 2 + 51 = 5 × 3`
`=> (10 - x) × 2 + 51 = 15`
`=> (10 - x) × 2 = 15 - 51`
`=> (10 - x) × 2 = -36`
`=> 10 - x = -36 : 2`
`=> 10 - x = -18`
`=> x = 10 - (-18)`
`=> x = 28`
Vậy `x = 28`