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2x=1
x=1/2
b) -x-4=0
-x=4
x= -4
c)1/2x+1=0
1/2x= -1
x= -2
d) -4x=0
x=0
e)8x=0
x=0
f) -0,3x-6=0
-0,3x=6 /* -10/3
x=-20
a) 0=2x-1
2x=1
x=0,5
b) 0=-x-4
-x=4
x=-4
c) 0=0,5x+1
0,5x=-1
x=-2
d) 0=-4x
x=0
e) 0=8x
x=0
f) 0=-0,3x-6
-0,3x=6
x=-20