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3x+9=2x+8+x+1
3x+9=3x+9 /-3x
9=9-rownanie tozsamosciowe
6.4(x-2)-2(x-4)=5(x+1)-3x
4x-8-2x+8=5x+5-3x
2x=2x+5 /-2x
0=5- rownanie sprzeczne, brak rozwiazan
7. 2(x-4)=2(2x-1)+6(x+1)
2x-8=4x-2+6x+6
2x-8=10x+4 /-2x
-8=8x+4 /-4
-12=8x /:8
-1.5=x
8. 1/2y +3=7 /*2
y+3=7 /-3
y=7
9. 3/5y+2/5=4 /*5
3y+2=4 /-2
3y=2 /:3
y=2/3
10. y/2+1/3=7/6 /*6
3y+2=7 /-2
3y=5 /:3
y=3/5
11. y+3/2-(1-y)=3,5 /*2
y+3-2+2y=7
3y+1=7 /-1
3y=6 /:3
y=2
12. 2y+4/4=1/2y+1 /*4
2y+4=2y+4 /-2y
4=4- rownanie tozsamosciowe
13. 1 3/4=2(x+2)+3(x+1/4) /*4
7=8(4x+8)+12(4x+1)
7=32x+64+48x+12
7=80x+76 /-76
-69=80x /:80
-0,8625=x
14. 4x+7/2-5x-1/6=x+5 /*6
12x+21-5x-1=6x+5
17x+20=6x+5 /-6x
11x+20=5 /-20
11x=-15 /:11
x=1 i 4/11
15. 4(3x+2)+5(2x+3)=-(2x+13)
12x+8+10x+15=-2x-13
22x+23=-2x-13 /+2x
24x+23=-13 /-23
24x=-36 /:24
x=-1,5
16. -0,07(10x-1)=0,3x
-0,7x+0,07=0,3x /+0,7x
0,07=x
17. 0,83x+0,82=0,23x+1,52 /-0,23x
0,60x+0,82=1,52 /-0,82
0,60x=0,70 /:0,60
x=1,1(6)
18. 0,6x+2(0,1x-0,1)=0,3x
0,6x+0,2x-0,2=0,3x
0,8x-0,2=0,3x /-0,8x
-0,2=-0,5x /:(-0,2)
2,5=x
19. 0,7(x+2)=0,4(x+1)+0,3x+1
0,7x+1,4=0,4x+0,4+0,3x+1
0,7x+1,4=0,7x+1 /-0,7x
1=1- rownanie tozsamosciowe
20. 0,15(2x+4)=0,05(3x-10)=0,4-0,35x
0,30x+0,60=0,15x-0,5=0,4-0,35x
-0,30x+0,15x+0,35x=0,5+0,60+0,4
0,20x=1,5 /*5
x=7,5
ps:tegop ostatniego nie jestem pewna ;)