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3x=x-(1-(x-3))
3x=x-(1-x+3)
3x=x-1+x-3
3x-x-x= -1-3
x= -4
b)
5x-(2x+(3-x))=11
5x-(2x+3-x)=11
5x-2x-3+x=11
4x=11+3
4x=14/:4
x=14/4
x=3 2/4
x=3 1/2
c)
1-(x-(x-(x-1)))=0
1-(x-(x-x+1)=0
1-(x-x+x-1)=0
1-x+x-x+1=0
-x=-1-1
-x= -2/*(-1)
x=2
d)
4-(3+2x)=5-(2x+6)
4-3-2x=5-2x-6
-2x+2x=5-6-4+3
0= -2
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