(3х+1)(2х-3)+4(х-2)=5(4-3х)
6x^2-9x+2x-3+4x-8=20-15x
6x^2+12x-31=0
D=b^2-4ac=144+4*6*31=888
x1=(-b-√D)/2a=(-12-√888)/12=-1 - √888 / 12
x2=(-b+√D)/2a=(-12+√888)/12= -1 + √ 888/12