16. 54 – 3y = 4y+72 17. 12 — 7x = 16x + 3 18. 5x-11 = 2x+7 19. 2х-11 = 17+3х+50

Question

16. 54 – 3y = 4y+72 17. 12 — 7x = 16x + 3 18. 5x-11 = 2x+7 19. 2х-11 = 17+3х+50

Answer 1

16) 54-3у=4у+72
-3у-4у=72-54
-7у=18
у= 18 :(-7)
у= - 2 4/7
17) 12-7x=16x+3
-7x-16x= 3-12
-23x= -9
x= 9/23
18) 5x-11=2x+7
5x-2x=7+11
3x=18
x=18:3
x=6
19) 2x-11=17+3x+50
2x-3x=67+11
-x=78
x= - 78