Răspuns:

a) 2x-1=9

2x=8

x=4

b) 12x-1=4x-65

8x=-64

x=-8

c) 15x+4=12x+6

3x=2

x=2/3

d) 5(x-1)+7(x-2)=5

5x-5+7x-14=5

12x-19=5

12x=24

x=2

e) x+3(2x-1)=3x+21

x+6x-3=3x+21

4x=24

x=6

f) 2(x-1)=5(x+5)

2x-2=5x+25

-3x=27

x=-9

g) 3x=5(3x+2)+26

3x=15x+10+26

-12x=36

x=-3

h) 3(2x-1)+2(x-1)=0

6x-3+2x-2=0

8x=5

x=5/8

i) 4(2x-1)+5(x-1)=10(2x+4)

8x-4+5x-5=20x+40

-7x=49

x=-7

j) 7(1-x)+6(2-3x)+3x=5(1-3x)

7-7x+12-18x+3x=5-15x

-10x=-14

x=10/14

si ultima se face asemanator, ai grija la calcule. Good luck!