1.

2a+5a=7a 6b-4b=2b 2x+7x-5x=3x

2.

5a+(2a-3b)= 3a-3b

7x-(4x-2y)= 3x+2y

3.

2a+5b. a=4 b=-3 = -7

4m-3n+10 m=-5, n=-8 = 14

4.

ա (x,y)=(4,3)

բ (x,y)=(2,1)

5. ա. (x+2)*5= 5x+10

բ.6*(3y-4)= 18y-24

6.

(x+2)*(x-3)=x²-x-6

(5x+1)*(2x+4)= 10x²+22x+4

7.

ա. a⁶

բ. x⁸

8.

8(x+3)=48 = x=3

5 (y-1)=30 = y=7

9.

10.

{x+y=28

{x-y=14

x= 28-y

28-y-y=14

2y=14

14*2=7

y=7

X14+[