Question

Решите уравнение: 1) 3(х+5)=7-5х 2) 4(х-9)=3(х-8) 3) 7(3-2х)=15(1-х) 4) 13-(2х-5)=х-3 5) 26-(17-2х)=5х

Answer 1

1) 3х+15=7-5х
   3х+5х = 7-15
8х=-8
х=-1

2)4х-36=3х-24
4х-3х=36-24
х=12

3) 21-14х=15-15х
21-15=14х-15х
х=-6

4) 13-2х+5 = х-3
  13+5+3 = 2х+х
21=3х
х=21:3
х=7

5) 26-17+2х=5х
9 = 5х-2х
3х=9
х=3