Question

Решить уровнения
1)3х-20=х+20
2)4(3-х)-11=7(2х-5)
3)3,8-у=3.6-у
   5.5    11
4)-7(3х-8)+3(4х+5)=8

Answer 1

1) 2х=40
х=2
2) 12-4х - 11 =14х-35
-18х = -36
х=2
3) не пойму условие
-21х+56 +12х+15 =8
-9х = -63
х=7

Answer 2

3х-20=х+20
3х-20-х-20=0
2х-40=0
2х=40
х=20

4(3-х)-11=7(2х-5)
12-4х-11=14х-35
12-4х-11-14х+35=0
-18х+36=0
18х-36=0
18х=36
х=2

4)-7(3х-8)+3(4х+5)=8
-21х+56+12х+15=8
-9х+63=0
9х-63=0
9х=63
х=7