Решите уравнения! 5х+7+2х+14=42, 16+3х+2+х=38, 3х+12-х-1=53, 9х+55+х-15=130,19х+25-2х+9=34

Question

Решите уравнения! 5х+7+2х+14=42, 16+3х+2+х=38, 3х+12-х-1=53, 9х+55+х-15=130,19х+25-2х+9=34

Answer 1

5х+7+2х+14=42
7х+21=42
7х=42-21
7х=21
х=21/7
х=3

16+3х+2+х=38
4х+18=38
4х=38-18
4х=20
х=20/4
х=5

3х+12-х-1=53
2х+11=53
2х=53-11
2х=42
х=42/2
х=21

9х+55+х-15=130
10х+40=130
10х=130-40
10х=90
х=90/10
х=9

19х+25-2х+9=34
17х+34=34
17х=34-34
17х=0
х=0/17
х=0