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 решите !

3(y-5)+8=17
3y-15+8=17
3y=17+15-8
3y=24:3
y=8
5(x+2)=6(2x+7)
5x+10=12x+42
5x-12x=42-10
-7x=32:(-7)
x=-4 4/7
5(x+3)=8(10-x)
5x+15=80-8x
5x+8x=80-15
13x=65:13
x=5
8(9+2x)=5(2-3x)
72+16x=10-15x
16x+15x=10-72
31x=-62:31
x=-2
6(x-3)-10=2(x+2)
6x-18-10=2x+4
6x-2x=4+28
4x=32:4
x=8
5(x-1)+20=4(x-3)
5x-5+20=4x-12
5x-4x=-12+5-20
x=-27
10y+2(7y-2)=5(4y+3)+3y
10y+14y-4=20y+15+3y
24y-20y-3y=15+4
y=19
8(3z-2)-13z=5(12-3z)+7z
24x-16-13z=60-15z+7z
11z+15z-7z=60+16
19z=76:19
x=4