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## Sagot :

v-12=20

v=32

2)u/5+3=1

u+15=5

u=-10

3)6+z/9=9

54+z=81

z=27

4)-7+f/2=-1

-14+f=-2

f=12

5)9+w/4=-5

36+w=-20

w=-56

6)e/7-3=-5

e-21=-35

e=-14

7)-8+d/5=2

-40+d=10

d=50

8)u/5+3=6

u+15=30

u=15

9)f/-3+5=8

f-15=-24

f=-9

[tex]4.\ -7+ \frac{f}{2} =-1\ \ / \cdot2 \\-14+f=-2\\f=-2+14\\f=12\\ \\ 5.\ 9+ \frac{w}{4} =-5\ \ /\cdot4\\ 36+w=-20\\w=-20-36\\w=-56\\ \\6.\ \frac{e}{7}-3=-5\ \ /\cdot 7\\e-21=-35\\e=-35+21\\e=-14[/tex]

[tex]7.\ -8+ \frac{d}{5} =2\ \ /\cdot5\\-40+d=10\\d=10+40\\d=50\\ \\8.\ \frac{U}{5} +3=6\ \ /\cdot5\\U+15=30\\U=30-15\\U=15\\ \\9.\ \frac{F}{-3} +5=8\ \ /\cdot(-3)\\F-15=-24\\F=-24+15\\F=-9[/tex]