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3y-6-9=6
3y=6+6+9
3y=21 |:3
y=7
5x+(4-3x)=12
5x+4-3x=12
5x-3x=12-4
2x=8 |:2
x=4
3(2x+8)-(5x+2)=0
6x+24-5x+2=0
6x-5x= -24-2+0
x=-26
8(3-2x)+5(3x+5)=9
24-16x+15x+15=9
-16x+15x= -24-15+9
x= 30
3y-6-9=6
3y=6+6+9
3y=21
y=7
2) 5x+(4-3x)=12
5x+4-3x=12
5x-3x=12-4
2x=8
x=4
3) 7(3y+6)+5(y-3)-2(y-7)=5
21y+42+5y-15-2y+14=5
21y+ 5y-2y=5-42+15-14
24 y=-36
y= -24/36= -2/3
4) 7(6z-1)+3(2z+1)-5(12z-7)=23
42z-7+6z+3-60z+35=23
42z+6z-60z= 23-3-35+7
-12z= -8
-z=-2/3
z=2/3
5) 3(2x+8)-(5x+2)=0
6x+24-5x-2=0
6x-5x=0-24+2
x= -22
6) 8(3-2x)+5(3x+5)=9
24-16x+15x+25=9
-16x+15x=9-25-24
-x= -40
x= 40
3y-6-9=6
3y-15=6
3y=6+15
3y=21 I:3
y=7
5x+(4-3x)=12
5x+4-3x=12
5x-3x+4=12
2x+4=12
2x=12-4
2x=8 I:2
x=4
7(3y+6)+5(y-3)-2(y-7)=5
21y+42+5y-15-2y+14=5
21y+5y-2y+42-15+14=5
24y+41=5
24y=5-41
24y=-36 I:6
4y=-6 I:4
y=-2/3
7(6z-1)+3(2z+1)-5(12z-7)=23
42z-7+6z+3-60z+35=23
42z+6z-60z-7+3+35=23
-12z+31=23
-12z=23-31
-12z=-8
12z=8 I:12
z=8/12
z=2/3
3(2x+8)-(5x+2)=0
6x+24-5x-2=0
6x-5x+24-2=0
x+22=0
x=-22
8(3-2x)+5(3x+5)=9
24-16x+15x+25=9
-x+25+24=9
-x+49=9
-x=9-49
-x=-40
x=40