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a) 3x+9=2x+8+x+1
3x-2x-x=8+1-9
-x=0
b) 12x+8+10x+15=-2x-13
12x+10x+2x=-13-8-15
24x=-36 /:24
x=1,5
c) 4x-8-2x+8=5x+5-3x
4x-2x-5x+3x=5+8-8
0=5
d) 2x-8=4x-2+6x+6
2x-6x-4x=-2+6+8
-8x=12 /:-8
x=1,5
2.
a) 1/2y+3=7 /*2
y +6=14
y=14-6
y=8
c) 3y+6=5
3y=5-6
3y=-1 /:3
y=-1/3
d) 7y+21=5y+2+2y
7y-5y-2y=2-21
0=-19
e) y/2+1/3=7/6 /*6
3y + 2=7
3y=7-2
3y-5 /:3
y=5/3
f) y+3/2-(1-y)=3,5 /*2
2y+3-2+2y=7
4y=7-3+2
4y=6 /:4
y=1,5
h) 2y+4/4=1/2y+1 /*4
8y+4=2y+4
8y-2y=4-4
6y=0 /:6
y=0/6
3x-2x-x=8-9+1
x=0