50 уравнение- 1. 7x-8x 2. 15a-a 3. -7x+8x 4. -15+a+6 5. -5x+6x-x 6. -13a-8a+a 7. y-5y+6 8. 3x-5x+7x 9.-a+2a-8a+2 10. 12-3n+5n 11. 6x-12-7x 12. -6a-12a-7 13. 9d-3d-20 14. -8a+6a-5a 15. x-6-3x+9 16. 6y-17y+12y 17. -6y+17y+12 18. -5k-k+15k 19. -8x+x+3x 20. -9m-m+1

7х-8х=-х

15а-а=14а

-7х+8х=х

-15+а+6=а-9

-5х+6х-х=-6х+6х=0

-13а-8а+а=-21а+а=-20а

у-5у+6=6-4у

3х-5х+7х=-2х+7х=5х

-а+2а-8а+2=2-7а

12-3n+5n=12+2n

6x-12-7x=-x-12

-6a-12a-7=-18a-7

9d-3d-20=6d-20      

 -8a+6a-5a=-7a        

x-6-3x+9=3-2x        

6y-17y+12y=y  

-6y+17y+12=11у+12   

-5k-k+15k=9k              

-8x+x+3x=-4x

-9m-m+1=1-10m

1. 7x-8x =-х

2. 15a-a =14а

3. -7x+8x=х

4. -15+a+6=а-9

5. -5x+6x-x =0

6. -13a-8a+a =-29а

7. y-5y+6 =4у+6

8. 3x-5x+7x =9х

9.-a+2a-8a+2 =2-7а

10. 12-3n+5n =12+2n

11. 6x-12-7x =-12-х

12. -6a-12a-7 =-18а-7

13. 9d-3d-20 =6d-20

14. -8a+6a-5a =-7a

15. x-6-3x+9 =3-2x

16. 6y-17y+12y =y

17. -6y+17y+12 =11y+12

18. -5k-k+15k =9k

19. -8x+x+3x=-4x

20. -9m-m+1=1-10m