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X=16
B) 6-x-x/2=4 /*2
12-2x-x=8
-3x=8-12
-3x= -4 /:(-3)
x= 4/3
C) 3/4x-x-1=0 /*4
3x-4x-4=0
-1x=4 /:(-1)
x= -4
D) 1/5x+3= 5-1/2x
1/5x+1/2x= 5-3
7/10x=2 /: 7/10
x= 20/7