3+x-7=9x+52=? 4u-5+3u=3-50=? 5-8s=1+s-23=? 7-2x=42+4x-5=? u+3-6u=7-49=?

3+x-7=9x+52
X-9x=52+7-3
-8x=56
X=-7

4u-5+34=3-50
7u-5=-47
7u=-42
u=-6

5-8s=1+s-23
-8s-s=1-23-5
-9s=-27
s=3

7-2x=42+4x-5
-2x-4x=42-5-7
-6x=30
x=-5

u+3-6u=7-49
-5u=-45
u=9