Question

x-5=-2x+10
3x+21=
10x-100=90
3x+9=2x+50
3×-4=0

Answer 1

x-5=-2x+10
x+2x=10+5
3x=15
x=15/3
x=5

3x+21=
3x=-21
x=-21/3
x=-7

10x-100=90
10x=90+100
10x=190
x=190/10
x=19

3x+9=2x+50
3x-2x=50-9
x=41

3×-4=0
3x=4
x=4/3

Answer 2

1- x+2x=5+10 | 3x = 15 | x=5
2- 3x=21 | x = 21/3 | x=7
3-10x=90+100 | 10x=190 | x=190/10 | x=19
4-3x-2x = 50-9 | x = 41
5-3x=4 | x = 1,333....