Question

Решите уравнение:
2х+9=2х-4
9(х-1)=х+15
(11х+14)-(5х-8)=25
12-4(х-3)=39-9х
2(3х+5)-3(4х-1)=121

Answer 1

1)2x+9=2x-4
2х-2х=-9-4
х=-13

2)9(х-1)=х+15
9х-9=х+15
9х-х=9+15
8х=24
х=3

4)12-4(х-3)=39-9х
12-4х-12=39-9х
-4х+9х=39-12+12
5х=39
х=39/5

5)2(3х+5)-3(4х-1)=121
6х+10-12х-3=121
6х-12х=121-10+3
-6х=114
х=19