(x-4)/5+(3x-2)/10=(2x-5)/3-(x+2)/6
<=>(x-4)6/30+(3x-2)3/30=(2x-5)10/30-(x+2)5/30
<=>(x-4)6+(3x-2)3=(2x-5)10-(x+2)5
<=>3[(x-4)3+(3x-2)]=5[(2x-5)5-(x+2)]
<=>3(3x-12+3x-2)=5(10x-10-x-2)
<=>3(6x-14)=5(9x-12)
<=>18x-42=45x-60
<=>18x-45x=42-60
<=>27x=18
<=>x=2/3
vậy S=2/3
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