kejain prku ya pliiiis

13. x + 8 = 15
x = 15 - 8
= 7
14. x × 5 = -12
x = -12 - 5
= - 17
15. x + 16 = 7
x = 7 - 16
= - 9
16. x - 9 = 10
x = 10 + 9
= 19
17.x - 14 = 18
x = 18 + 14
= 32
18. y - 27 =-18
y = -18 + 27
= 9
19. 3y = 2y - 18
3y - 2y = - 18
y = -18

20.5y = 4y + 10
5y - 4y = 10
y = 10
21. 7y + 12 = 6y
7y - 6y = -12
y = -12
22. 9y - 15 = 8y
9y - 8y = 15
y = 15