1)|x+8|=0
x+8=0
x=0-8
x=0
2)|x+4|=7
x1+4=7
x2+4=-7
x1=3
x2=-11
3)|2x+4|=4
2x1+4=4
2x2+4=-4
x1=0
x2=-4
4)|3x-5|=4
3x1-5=4
3x2-5=-4
x2=1/3
5)|25-b|=-2+4
|25-b|=2
25-b1=2
25-b=-2
b1=23
b2=27
6)|0,8x+4|=4
0.8x1+4=4
0.8x2+4=-4
x2=-10
7)|4x-7-2|=3
|4x-9|=3
4x1-9=3
4x2-9=-3
x2=3/2=1 1/2
8)|0.6x-0.55x+3.95x|=15:0.3
|4x|=50
4*|x|=50
|x|=25/2
x1=25/2= -12.5
x2=-25/2=12.5
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Answers & Comments
1)|x+8|=0
x+8=0
x=0-8
x=0
2)|x+4|=7
x1+4=7
x2+4=-7
x1=3
x2=-11
3)|2x+4|=4
2x1+4=4
2x2+4=-4
x1=0
x2=-4
4)|3x-5|=4
3x1-5=4
3x2-5=-4
x1=3
x2=1/3
5)|25-b|=-2+4
|25-b|=2
25-b1=2
25-b=-2
b1=23
b2=27
6)|0,8x+4|=4
0.8x1+4=4
0.8x2+4=-4
x1=0
x2=-10
7)|4x-7-2|=3
|4x-9|=3
4x1-9=3
4x2-9=-3
x1=3
x2=3/2=1 1/2
8)|0.6x-0.55x+3.95x|=15:0.3
|4x|=50
4*|x|=50
|x|=25/2
x1=25/2= -12.5
x2=-25/2=12.5