How to factorize the square of 12x-11x-5

How to factorize the square of 12x-11x-5


Multiply by a cross
=(3x+1)(4x-5)



How to get the equation x = - 2 from the equation 15x = 11x-8


15x=11x-8
15x-11x=-8
4x=-8
x=-2