Решите уравнение:
5-(1-(2х-5))=2009

5-(1-2х+5)=2009; 5-1+2х-5=2009; 2х=5-1-5+2009; 2х=2008; х=2008÷2; х=1004

5-(1-(2х-5))=20095-1+(2х+5)=20095-1+2х+5=20094+2х+5=20092х=2009-4-52х=2000х=2000:2х=1000