`a, 2/3x - 3/2x = 5/12`
`=> x(2/3 - 3/2) = 5/12`
`=> 5/6x=5/12`
`=> x=5/12÷5/6`
`=> x=1/2`
Vậy `x=1/2`
`b, 2/5 + 3/5(3x-3.7) = -53/10`
`=> 2/5 + 3/5(3x-21) = -53/10`
`=> 3/5(3x-21)=-53/10-2/5`
`=> 3/5(3x-21)=-57/10`
`=> 3x-21=-57/10÷3/5`
`=> 3x-21=-19/2`
`=> 3x=-19/2+21`
`=> 3x=23/2`
`=> x=23/2÷3`
`=> x=23/6`
Vậy `x=23/6`