1. 26-5m=2-9m    2. 9z+11=13z-1    3. 12a+31=23a-2    4. 2(x-2)-1=5(x-2)-7    5. -y+20=-y         6. 4(2y-6)=4y-4      7. -9n+3=3(8n+45)     8. 20+5m=44+m     9. 27-4k=3-8k     10. 5b+11=7b-3 11. 8a+11=4a-1

1. 26-5m=2-9m 9m-5m=2-26 4m=-24 m=-24/4 m=6 2. 9z+11=13z-1 9z-13z=-11-1 -4z=-12 z=12/4 z=3 3. 12a+31=23a-2 12a-23a=-31-2 -11a=-33 a=33/11 a=3 4. 2(x-2)-1=5(x-2)-7 2x-4-1=5x-10-7 2x-5=5x-17 2x-5x=5-17 -3x=-12 x=12/3 x=4 5. -y+20=-y какое то некорректное 6. 4(2y-6)=4y-4 8y-24=4y-4 8y-4y=24-4 4y=20 y=20/4 y=5 7. -9n+3=3(8n+45) -9n+3=24n+135 -9n-24n=-3+135 -33n=132 n=-132/33 n=-4 8. 20+5m=44+m -m+5m=44-20 4m=24 m=24/4 m=6 9. 27-4k=3-8k 8k-4k=3-27 4k=-24 k=-24/4 k=6 10. 5b+11=7b-3 5b-7b=-11-3 -2b=-12 b=12/2 b=6 11. 8a+11=4a-1 8a-4a=-11-1 4a=-12 a=-12/4 a=3