Решите уравнение 3(-0,5+2х^2-(х+2)(2х-4))=5х-20

3(-0,5+2х^2-(x+2)(2x-4))=5x-20 3(-0.5+2x^2-(2x^2-8))=5x-20 3(-0.5+8)=5x-20 3*7.5=5x-20 5x-20=22.5 5x=42.5 x=42.5/5 x=8.5