`a)`
`(x+2)(3x-2)-(3x-1)(x-5)=11`
`\to (3x^2+4x-4)-(3x^2-16x+5)-11=0`
`\to 3x^2+4x-4-3x^2+16x-5-11=0`
`\to (3x^2-3x^2)+(4x+16x)+(-4-5-11)=0`
`\to 20x-20=0`
`\to 20x=20`
`\to x=1`
Vậy `x=1`
$\\$
`b)`
`2(2y+1)(8y-3)+(3-4y)(8y-7)=6y+73`
`\to (32y^2+4y-6)+(-32y^2+52y-21)-6y-73=0`
`\to 32y^2+4y-6-32y^2+52y-21-6y-73=0`
`\to (32y^2-32y^2)+(4y+52y-6y)+(-6-21-73)=0`
`\to 50y-100=0`
`\to 50y=100`
`\to y=2`
Vậy `y=2`