1)[3x-1]=0,
3x-1=0
3x=1
x=1/3.
2)[7x-2]=0
7x-2=0
7x=2
x=2/7
3)[5x-4]=0
5x-4=0
5x=4
x=4/5
4)[10x-1]=0
10x-1=0
10x=1
x=1/10
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Answers & Comments
1)[3x-1]=0,
3x-1=0
3x=1
x=1/3.
2)[7x-2]=0
7x-2=0
7x=2
x=2/7
3)[5x-4]=0
5x-4=0
5x=4
x=4/5
4)[10x-1]=0
10x-1=0
10x=1
x=1/10