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2x+1=5x
2x=5x-1
-3x=-1 |:(-1)
3x=1 |:3
x=1/3
f) -x/2x-4=3x/1-6x
-x(1-6x)=3x(2x-4)
-x+6x^2=6x^2-12x
-x=-12x
-x+12x=0
11x=0
x=0