Question

11. 3(y-5)+8=17 12. 5(x+2)=6(2x+7) 13. 5(x+3)=8(10-x) 14. 8(9+2x)=5(2-3x) 15. 6(x-3)-10=2(x+2) 16. 5(x-1)+20=4(x-3) 17. 10y+2(7y-2)=5(4y+3)+3y 18. 8(3z-2)-13z=5(12-3z)+7z 19.1/3(2x-3)=4 1/6x

Answer 1

11. 3(y-5)+8=17
3y-15+8=17
3y=24
y=8

12. 5(x+2)=6(2x+7)
5x+10=12x+42
-7x=32
x=4,57

13. 5(x+3)=8(10-x)
5x+15=80-8x
13x=95
x=7,307

14. 8(9+2x)=5(2-3x)
72+16x=10-15x
31x=-62
x=-2

15. 6(x-3)-10=2(x+2)
6x-18-10=2x+4
4x=32
x=8

16. 5(x-1)+20=4(x-3)
5x-5+20=4x-12
x=-27

17. 10y+2(7y-2)=5(4y+3)+3y
10y+14y-4=20y+15+3y
y=19

18. 8(3z-2)-13z=5(12-3z)+7z
24z-16-13z=60-15z+7z
19z=76
z=4

Answer 2

11. Решение: 3(y-5) + 8 = 17 3y - 15 + 8 = 17 3y - 7 = 17 3y = 24 y = 8

12. Решение: 5(x+2) = 6(2x+7) 5x + 10 = 12x + 42 -7x = 32 x = -4.57

13. Решение: 5(x+3) = 8(10-x) 5x + 15 = 80 - 8x 13x = 65 x = 5

14. Решение: 8(9+2x) = 5(2-3x) 72 + 16x = 10 - 15x 31x = -62 x = -2

15. Решение: 6(x-3) - 10 = 2(x+2) 6x - 18 - 10 = 2x + 4 4x = 32 x = 8

16. Решение: 5(x-1) + 20 = 4(x-3) + 17 5x - 5 + 20 = 4x - 12 + 17 x = 4

17. Решение: 10y + 2(7y-2) = 5(4y+3) + 3y 10y + 14y - 4 = 20y + 15 + 3y y = -2

18. Решение: 8(3z-2) - 13z = 5(12-3z) + 7z 24z - 16 - 13z = 60 - 15z + 7z 22z = 76 z = 3.45

19. Решение: 1/3(2x-3) = 4 + 1/6x 2x - 3 = 12 + 1/6x 12x - 18 = 72 + x 11x = 90 x = 8.18