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a. x+x-1=3
2x= 3+1
2x = 4 / : 2
x = 2
b.2x-x+4,5 = 8,5
x= 8,5-4,5
x= 4
c. 2(2x+1)=8
4x+2=8
4x= 8 -2
4x= 6 / : 4
x= 6/4
x= 3/2
d.x+(3x-5)=7
x-3+5=7
x= 7-5+3
x= 5
e. 3x-(x+5)= -1
3x + x -5 = -1
4x= -1+5
4x=4 / :4
x = 1
f. 2(x+1)-4x=1
2x+2 - 4x= 1
2x-4x= 1 -2
- 2x= - 1/ : ( -2)
x= 1/2
10.
a.2(x+3)=18
2x+6=18
2x=18-6
2x= 12/ :2
x= 6
b.x+ 3(x-2)= - 22
x+ 3x-6 = - 22
4x= - 22 + 6
4x = - 16 / : 4
x = - 4
c.5x- 2 (x+3)=9
5x-2x-6=9
3x=9 +6
3x= 15 / :3
x=5
d.4(2x+3)-5x=-3
8x + 12 - 5x= - 3
3x= -3-12
3x= - 15 / : 3
x = - 5
e. 2(x+1)+5x=16
2x+2 + 5x= 16
7x= 16-2
7x = 14 / : 7
x=2
f.-4x-3(2x+1)=7
- 4x - 6x- 3 = 7
- 10 x = 7+3
- 10x= 10 / : (-10)
x = - 1