` \color{#0074D9}{#n}\color{#0088DD}{q}\color{#3399FF}{o}\color{#66AAFF}{c}\color{#99CCFF}{c} `

`3x + 2x^2 + 8x + x + 17 + 36 = 67 + 2x + 4x^2 - 3x + 3 ` 

`2x^2 + 12x + 53 = 4x^2 - x + 70 `

`2x^2 - 4x^2 + 12x + x + 53 - 70 = 0 `

`-2x^2 + 13x - 17 = 0 `

`a = -2 ; b = 13 ; c = -17`

`Δ = b^2 - 4ac`

`= 13^2 - 4 * (-2) * (-17)`

`= 33 > 0 `

nên phương trình có 2 nghiệm phân biệt 

`x_1 = {-b + sqrt{Δ}}/{2a} = {-13 + sqrt{33}}/{2 * (-2)} = {13 - sqrt{33}}/4 `

`x_2 = {-b - sqrt{Δ}}/{2a} = {-13 - sqrt{33}}/{2 * (-2)} = {13 + sqrt{33}}/4 `

Vậy `x_1 = {13 - sqrt{33}}/4 ; x_2 =  {13 + sqrt{33}}/4 `