Question

Решите уравнения
2x-(1+9x)=20
3x-15.6=0
8x+2=3x-18

Answer 1

2х-(1+9х)=20
2х-1-9х=20
-7х=20+1
-7х=21
х=21:(-7)
х=-3

3х-15,6=0
3х=15,6
х=15,6:3
х=5,2

8х+2=3х-18
8х-3х=-18-2
5х=-20
х=-20:5
х=-4