Question

Помогите решить.
1)2х+4(5+х)=24
2)4х+5х+3(3+х)=0
3)4(х+5)=5(х-2)
4)5(4+х)-4(5-2х)=0

Answer 1

2х+4*(5+х)=24
2х+4*5+4х=24
2х+20+4х=24
2х+4х=24-20
6х=4
х=4/6=2/3
проверка: 2*2/3+4*(5+2/3)=2*2/3+20+4*2/3=4/3+20+8/3=20+12/3=20+4=24
24=24

Answer 2

4х+5х+3*(3+х)=0
4х+5х+9+3х=0
4х+5х+3х=9
12х=9
х=9/12=3/4