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x=4/5
b) -7/x-1=8
-7/x=8
x=8-7
x=1
c)x/2x+1=1
x/2x=1
0,5x=1
x=1-0,5
x=0,5
d)-6x/2x-5=2
-3x-5=2
-3x=2+5
-3x=7/:3
x=7/3